1 Month in Thailand Itinerary – PERFECT for First Timers
Often referred to as the “Land of Smiles” due to the friendly locals, Thailand truly is one of the most amazing places I’ve visited. So much so, that I extended my trip and ended up spending a whole month there.
Thailand is the perfect destination for any type of traveller – whether you’re solo or in a couple, backpacking or searching for a slice of luxury.
Following my 1 month Thailand itinerary will take you to vibrant cities, idyllic beaches, lush jungles, and historic temples.
This itinerary is the perfect mix of activities and relaxation. You’ll go snorkelling in crystal clear waters, explore ancient temples, discover tiny islands and learn how to cook local dishes.
How to spend 1 month in Thailand: overview
- Bangkok – 3 days
Eastern islands
- Bangkok to Koh Chang – 1 day
- Koh Chang – 3 days
- Koh Kood – 3 days
- Koh Mak – 2 days
Southern Islands
- Koh Mak to Koh Phi Phi – 1 day
- Koh Phi Phi – 1 day
- Koh Lipe – 4 days
- Koh Lipe to Koh Lanta – 1 day
- Koh Lanta – 4 days
Northern Thailand
- Koh Lanta to Chiang Mai – 1 day
- Chiang Mai – 3 days
- Chiang Rai – 3 days
How I put my 1 month Thailand itinerary together
I visited Thailand for the first time at the age of 29, and I felt a little too old for the typical Thailand backpacking route.
I wanted to avoid “party islands”, so you won’t find places like Koh Samui or Koh Tao in this guide, but you will find more off the beaten track destinations that have far fewer tourists.
Steering clear of the tourist trail means that you’ll need to set aside a little more time to travel in between places (which I’ve accounted for in this guide), but I promise it’s so worth it to escape the crowds and discover more remote islands.
30 days in Thailand itinerary – from Bangkok to beaches
Bangkok – 3 days
Bangkok is Thailand’s capital city, and you’ll most likely be flying into one of its airports (there’s two), which makes it the perfect first stop on your 1 month Thailand itinerary.
A lot of people actually told me to skip Bangkok, I was told that it was too chaotic, and that it would be best to head straight for the islands. But I’m so glad I didn’t listen to that advice. I absolutely fell in love with this city. Yes, it’s chaotic, but in the best possible way. It’s full of life, vibrant sights, amazing culture, and an incredible food scene.
Day 1
Head to ICONSIAM, Bangkok’s incredible shopping centre with over 7,000 shops spread across 7 levels. Normally I wouldn’t waste my time in a shopping centre when I’m travelling, but I made an exception here and I’d strongly recommend you do the same. There’s a floating food market, a cinema, and a rooftop bar with unrivalled views over the city.
ICONSIAM sits on the Chao Phraya river, which flows through the centre of Bangkok, and from there you can jump on the hop on hop off boat. There’s a pier right outside the shopping centre and you can get tickets online ahead of time, or from the booth next to the pier before you board.
Travelling by boat was my favourite way to get around Bangkok, there’s no traffic so you get places much faster than by car, it’s super affordable, and you get a completely unique perspective of the city.
In the afternoon, head to Chinatown, where you’ll find an incredible street food scene.
Day 2
Wake up early to get to Bangkok’s most popular attractions before the crowds. First up is Wat Arun, a stunning Buddhist temple with an intricate design. You can climb the steps of the temple for amazing views of the river.
From Wat Arun, it’s just a short journey by boat to the Grand Palace on the other side of the river. The palace has been the official residence of the Kings of Thailand since the 1700s, and although they no longer live there, it’s still used for ceremonies. It’s made up of a number of buildings, including Wat Phra Kaew, famous for its huge reclining buddha.
Top tip: When visiting these temples (and any temple in Thailand) make sure you cover your legs and shoulders. I always carry a cover up in my bag so I can quickly put it on.
Day 3
Head to the famous Khao San Road, Bangkok’s busiest backpacker street. It’s a sensory overload, packed with bars, shops, and street food stalls, but a must visit on your trip to Bangkok.
If you’re visiting Bangkok over a weekend, head to Chatuchak Market, the biggest one in the city with over 10,000 vendors.
Grab dinner at one of Bangkok’s Michelin Guide restaurants. There’s hundreds located across the city, ranging from affordable street food to fine dining experiences. Download the Michelin Guide app to find the ones nearest you.
End your day at Pak Khlong Talat, Bangkok’s 24 hour flower market. The beauty of this market is that you can visit at whatever time of day you want, and each time you’ll have a different experience. But it’s most lively in the early hours of the morning, when the flower deliveries are arriving and the market is a hub of activity.
If you have time, you could also take a trip to Ayutthaya, the former capital of Thailand, and now a UNESCO World Heritage Site.
Where to stay in Bangkok
Bangkok has an excellent transportation system, so don’t worry too much about where you stay as it’s really easy to get around.
If you’re on a budget, RALPH hostel is the perfect choice. It offers free bikes, a garden, a rooftop with incredible views, and clean and modern rooms. Plus it’s just a 12 minute walk from The Grand Palace, and you can get a private room from as little as £17 per night!
Or if you want something with more amenities, Novotel Bangkok Sukhumvit has an outdoor pool with views over the city, a restaurant, and a rooftop bar.
Travel from Bangkok to Koh Chang – 1 day
After the hustle and bustle of Bangkok, you’ll want to relax for a while, so the next stop on your 1 month Thailand itinerary is Koh Chang. Although it’s Thailand’s third largest island, it’s not on the typical tourist trail, which makes it a lot less crowded.
You can fly from Bangkok to Trat airport, and from there you’ll need to take a taxi to Ao Thammachat Pier, and a ferry to Koh Chang.
The flight takes 1 hour, followed by a 20 minute transfer to the pier, and a 30 minute ferry crossing.
Make sure you book your flight well in advance otherwise it gets very expensive. I left it really late so instead took a bus from Bangkok centre directly to Koh Chang.
The minibus drives you from Bangkok to Ao Thammachat Pier, onto the ferry, and then to your hotel on Koh Chang when you get off. The total journey time is around 7 hours.
Travel tip: Use 12Go to book your travel in Thailand. It’s a really easy to use website that shows you the available routes for your journey and the price.
Eastern Islands
Koh Chang – 3 days
Koh Chang is located in the Gulf of Thailand, and is part of a group of more than 50 islands in the Mu Ko Chang National Park.
There’s a really laid back atmosphere here, and whilst it does have nightlife in some parts, it’s definitely not a party island.
Day 1
Spend your first day in Koh Chang unwinding at the hotel. You can’t spend 1 month in Thailand without some down days, and recharging and soaking it all in is just as important as ticking off the to-do list.
I stayed at The Retreat, and I can’t recommend it enough, it was one of the best hotels I’ve ever been to. It’s a newly opened luxury hotel with with unrivalled service, delicious food, really tasty cocktails and some of the best sunset views on the island.
Day 2
Rent a scooter to explore Koh Chang. Don’t miss Salak Phet Mangrove Forest, a walkway through the mangroves on the South East of the island.
There’s 7 waterfalls on the island, the most popular being Klong Plu Waterfall, which is a great swimming spot. You can also visit Kai Bae Viewpoint for one of the best sunset views on the island.
Day 3
Jump back on the scooter and head for the beaches. My favourites were Klong Koi, Khlong Prao and Kai Bae. You can also hire a kayak and go to the tiny island of Koh Ngam, located just off the South of Koh Chang.
Where to stay in Koh Chang
I loved my stay at The Retreat. The rooms are neutral and bright, with large bathrooms and incredible views over the ocean, there’s a huge swimming pool, gym, a brilliant restaurant with a varied menu, and a weekly events schedule including an outdoor cinema night.
They also have free bikes and kayaks you can use to explore the island. I truly believe this is the best place to stay in Koh Chang, you won’t want to leave!
Pajamas is a really popular hostel in Koh Chang, the rooms are clean and modern, there’s a large swimming pool and outdoor area, breakfast is included, and you’re just a 2 minute walk from Klong Prao Beach. A bed here starts from just £10 per night.
Koh Kood – 3 days
Also part of the Mu Ko Chang National Park, Koh Kood is even smaller than Koh Chang, and has some of the best beaches in Thailand. A ferry from Koh Chang to Koh Kood only takes 1.5 hours.
Day 1
Rent a scooter and spend the day exploring Koh Kood’s beaches. They’re some of the most beautiful in Thailand, and because this island is tricky to reach, they’re often completely empty. I’ve listed some of the best beaches below:
- Bang Bao
- Klong Chao
- Ao Tapao
- Ao Phrao
- Ao Noi
- Has Khlong Hin
Day 2
Head to Ban Ao Yai, a traditional fishing village with houses built on stilts over the water. If you visit around lunchtime, you’ll be able to enjoy freshly caught seafood from one of the restaurants.
Other popular spots on the island include Khlong Chao Waterfall, the Klong Chao River and Wat Ao Phrao, a small Buddhist temple.
Day 3
Head out on a snorkelling trip to the vibrant reefs of Koh Rang National Park. On this highly rated tour you’ll visit 3 snorkelling stops, and lunch and refreshments are included with your ticket.
Where to stay in Koh Kood
Koh Kood has lots of beautiful hotels to choose from, I stayed at A La Koh Kood Resort, a really unique place located within the mangroves. Kayaks are available free of charge for you to explore the surrounding mangroves and it’s such a fun experience. There’s no swimming pool but you’re only 30 seconds away from a beautiful beach.
Hideout Koh Kood is a stunning hotel, each villa is bright with plenty of space, and some even have their own swimming pools. There’s also a communal pool, bar and a large garden.
Koh Mak – 3 days
Koh Mak is a really sleepy island, and the perfect place for unwinding and relaxing on the beach. There’s not much going on in the evenings here, but it has an amazing feel about it. You can take a direct ferry from Koh Kood to Koh Mak in just 30 minutes.
Day 1
Similarly to Koh Kood, the main thing to do here is to rent a scooter and explore the incredible beaches. I’ve listed my favourites below:
- Ao Tao Kai (turtle beach)
- Suan Yai
- Laem Son
- Ao Pra
- Ao Ta Long
- Ao Lam
- Laem Tukata
- Ao Tao Kai
- Ao Kao
When you’ve had enough of relaxing on the beach, drive to Cinnamon Scenic Boardwalk, which has amazing views over the ocean.
Head for dinner at Ma Bistro, a Western restaurant serving delicious home cooked meals. Be prepared to wait as there’s often a queue, or get there early to avoid it!
Day 2
Take a day trip to Koh Kham, an uninhabited island just a short boat ride from Suan Yai Bay (you can get tickets on the beach). This island is absolutely beautiful, with crystal clear water and bright white sand. You’ll need at least a few hours here, and there’s a small stall where you can buy drinks and snacks.
When you’re back on Koh Mak, grab lunch at 12Bar KohMak. It’s a Japanese restaurant and the food was unbelievable, and a real treat when you’re on a tiny island in the middle of Thailand!
In the afternoon, enjoy a relaxing massage at one of the spas on the island.
Where to stay in Koh Mak
Koh Mak doesn’t have a huge amount of choice of accommodation, so I’d recommend booking it in advance to avoid any disappointment.
Mira Montra is my top pick on Koh Mak. Rooms start from just £39 a night, they’re spacious, modern, and have incredible views over the ocean. On the resort there’s a large swimming pool, a restaurant, bar, treatment roms and acces to a private sandy beach.
Southern Islands
Koh Phi Phi – 2 days
Located in the Krabi province, Koh Phi Phi is one of the most popular places on a Thailand backpacking route, and with good reason. It’s made up of 6 islands, known for their vibrant blue water (it was easily the brightest water we saw during our 1 month in Thailand!).
Set aside two days in your 1 month Thailand itinerary for Koh Phi Phi – one for travelling there, and the other for the Phi Phi islands tour. Unless you’re a big partier, I wouldn’t stay any longer than two days.
Day 1
You’ll need to set aside this day for travelling to Koh Phi Phi, as you’ll be covering a big distance from Koh Mak.
Take the ferry from Koh Mak to Laem Ngop Pier in Trat (around 1 hour), and then a taxi to Trat airport (30 minutes). You’ll then need to fly to Bangkok (1 hour), and then on to Phuket (1.5 hours). From Phuket airport, take a transfer to Rassada Pier (1 hour), and catch a ferry from Phuket to Koh Phi Phi (2 hours).
Day 2
Wake up early for your Phi Phi islands tour. You’ll visit Monkey beach, Viking Cave, Bamboo Island and Pi Leh Bay – one of the most recognisable landmarks in Thailand, with dramatic limestone cliffs surrounding an emerald lagoon.
The most popular location on the tour is Maya Bay, famous for its appearance in the movie “The Beach”. There’s a very narrow walkway to get onto the beach, and you want to be one of the first groups there, otherwise you’ll be queueing forever to reach it.
You have two options when it comes to booking your tour – a shared boat (cheaper), or a private longtail boat (more expensive). You’re only going to do this once, so I’d really recommend getting the longtail boat for a more personalised experience.
Where to stay in Koh Phi Phi
Stay as close as possible to the tour pick up point, which is at The Coffee Club cafe. Panmanee Hotel is less than a 1 minute walk away, with modern and spacious bedrooms.
This hotel is also a great choice for getting to Koh Lipe, the next stop on your 1 month Thailand itinerary, as it’s just a 2 minute walk from Ton Sai Pier, where the boat departs from.
Koh Lipe – 4 days
Often referred to as the Maldives of Thailand, Koh Lipe is known for its crystal clear water, white sandy beaches, and colourful marine life. It’s a tiny island (so tiny you can walk from one side to the other), located near the border of Malaysia.
For this reason, a lot of people miss Koh Lipe on their visit to Thialand because it’s not the easiest place to reach.
But it was my favourite place I visited, its small size means you often see the same people at dinner each night, and I formed amazing friendships and a real sense of community in the days I spent there.
Day 1
Spend your first day on Koh Lipe relaxing on the idyllic beaches. There’s 3 main beaches here – Sunrise Beach, Pattaya Beach and Sunset Beach. Sunrise Beach was my favourite, with powdery-white sand, turquoise blue water, and long tail boats lining the shore.
If you walk to the end of the beach you’ll come to North Point beach. Known for its distinctive white sandbar that cuts through the turquoise water, it’s the perfect place for a lazy afternoon.
Day 2
Wake up early to catch the incredible sunrise from Sunrise Beach (it gets its name for a reason). Then head to Walking Street – where the majority of the islands bars and restaurants are, for a delicious brunch at Elephant Cafe.
Walking Street is also where you’ll find the islands dive schools, and I’d definitely recommend scuba diving or snorkelling whilst you’re here, as the waters are home to 25% of the world’s tropical fish species.
In the evening, head to Tonkow for dinner, where you’ll get a delicious slow cooked Massaman curry.
Afterwards, head back to Walking Street where you’ll find some brilliant bars. I spent my nights in Koh Lipe in Home Bar, Rainforest, The Living Room and Tapeo. If you want to experience a full moon party, there’s a brilliant one at Zodiac.
Day 3
Koh Lipe is part of the Tarutao National Marine Park, made up of over 50 islands and known for its clear waters and abundant marine life.
Head out island hopping with a boat trip to 7 islands around Koh Lipe. The tour includes a pick up from your hotel, lunch, and snorkelling at each of the stops.
Day 4
Take a long tail boat from Sunrise Beach to Ko Kla, a tiny island with a hidden beach just a 10 minute boat ride away. There’s no need to book in advance, just agree a price with the captain when you want to go.
Where to stay in Koh Lipe
I stayed at Irene Resort, a luxury resort located on Sunrise beach. This hotel is absolutely beautiful, with beachfront villas featuring their own private pools, a large communal swimming pool and swim up bar, a restaurant, bar, live music every evening, and a variety of activities available to book from the resort.
Koh Lanta – 4 days
On Koh Lanta you’ll find stunning beaches, waterfalls, jungle and a historic old town. There’s also a brilliant choice of restaurants here – some of my favourite meals from my 1 month in Thailand were in Koh Lanta.
Although Koh Lanta is quite a big island, it’s relatively spread out so it doesn’t feel crowded, making it the perfect place to unwind for a few days.
Day 1
Rent a scooter and head to Tuesday Morning Small Talk for breakfast. This little cafe serves delicious, fresh dishes with a view over the ocean.
Spend the rest of your day hopping between Koh Lanta’s incredible beaches. Most of them are found on the West coast (where you’ll already be for breakfast). Some of my favourites were Nui Beach, Khlong Chak Beach, and Kantiang Bay.
Day 2
The best thing I did in Koh Lanta (and one of my favourite things I did during my 1 month in Thailand), was visit Lanta Animal Welfare. It’s a non profit charity doing incredible work to care for injured animals on Koh Lanta, and their sterilisation programme has helped to dramatically reduce the number of stray cats and dogs on the island.
You can book a tour of the centre through their website, where you’ll learn about the amazing work they do, and get to meet some of the animals. They rely on donations to keep the centre running, so you’re doing a good thing by visiting!
Day 3
Spend your morning at Koh Lanta’s historic Old Town. It was once the islands main trading centre and you’ll see influence from communities around the world here.
The main street is lined with buildings on stilts, most of which have been turned into shops, restaurants and bars. Stop for breakfast at Grandma’s House – a small restaurant run by a family who have lived in Koh Lanta for generations. They make their bread fresh each day and the avocado on toast was particularly good.
If it’s past 11:30am, head across the road to Mayuri’s bar. Run from the owners Grandparents home, this incredible building is littered with history, with pictures, souvenirs and antiques scattered across the walls.
Head through to the back and you’ll be treated to views across the water, make sure you order an Espresso Martini, it rivalled any I’ve had in London.
Jump back on your scooter and head down to Baja Taco for a leisurely lunch. I ate here twice here during my stay, the tacos are sensational. It only opens for 4 hours a day, and it’s always packed.
Day 4
Koh Lanta is an incredible place to scuba dive or snorkel, thanks to its vibrant reefs and marine life. If you’ve never tried scuba diving before, you can do a discovery dive where you learn how to use the equipment in shallow water. Or, if you prefer staying at the surface, this snorkelling tour is really highly rated.
You’ll have worked up an appetite from being in the water, so head for lunch at Coco Tango. This beachfront restaurant has some of the best views on the island, and equally delicious food – especially the Massaman curry.
After a relaxing afternoon, grab dinner from Mr. Pad Thai. This roadside stall is run by a Koh Lanta local, who serves just two options – Pad Thai with chicken or without. You can grab beer from the shop next door and enjoy a delicious dinner for less than £2.
Afterwards, it’s a 30 second walk to Long Beach, where you’ll catch an incredible sunset. I couldn’t think of a better way to end your time in Koh Lanta.
Where to stay in Koh Lanta
Layana Resort & Spa is my top pick for a hotel on Koh Lanta. This adults-only hotel has a huge outdoor infinity pool, stunning views over the ocean, 3 restaurants, a spa, private beach access, and spacious rooms with outdoor terraces and large bathrooms. Plus, it’s won multiple awards and is very highly rated by its guests.
Northern Thailand
Know before you go: Every year from January – April, Northern Thailand experiences “burning season”, when farmers burn their crops to get ready for the next season. This reduces the air quality and creates a foggy haze that can make it harder to see. I visited during this time and it was absolutely fine, but it’s something you might want to consider when planning your trip.
Chiang Mai – 3 days
The largest city in Northern Thailand, Chiang Mai is an incredible blend of the old and the new. Here you’ll find ancient temples alongside bustling markets, great restaurants and an excellent live music scene.
Day 1
There’s over 300 temples in Chiang Mai, so no matter where you’re staying, there’ll be one nearby. Wat Phra Singh and Wat Chedi Luang are among the most popular, but make sure you seek out the lesser known ones too. Wat Umong is particularly interesting, it’s was built in the 14th century and features a series of underground tunnels.
For lunch, you have to try Khao Soi, a dish originating from Northern Thailand. It’s a soup made from soft, egg noodles cooked in a broth with really tender meat and topped with more crispy noodles. Khao Soi Maesai is the most famous place to try it – it’s made the Michelin Guide 3 years in a row. Be prepared to queue but it’s so worth the wait.
In the afternoon, head to the Wat Ket district. This waterside neighbourhood is full of independent shops and cafes and was one of my favourite places in Thailand. Don’t miss the rice dumplings at Lung Khajohn Wat Ket, an unassuming roadside stall that features on the Michelin Guide. Afterwards, head for pastries at Khagee coffee shop.
Day 2
It’s time for a cooking class! I’d recommend doing a few during your 1 month in Thailand, as each region has different local dishes. I did a morning class with Zabb E Lee and it was incredible value for money.
You’ll start your day at the local market where you’ll learn more about the ingredients you’ll be cooking with, before being driven 30 minutes outside of Chiang Mai to the cooking school, located on a farm surrounded by rice fields.
You get to cook 4 dishes and a sticky rice with mango (a very famous Thai dessert), and you’ll definitely need to take some home with you because there’s SO much food.
In the evening, visit Chiang Mai’s Night Bazaar – a sprawling market where locals come to sell street food, souvenirs and clothes.
DAY 3
Take a Tuk Tuk to Wat Phrathat Doi Suthep, a vast Buddhist temple built into the side of the Doi Suthep mountain, about 30 minutes outside of Chiang Mai.
The temples most striking feature is the incredible serpent staircase you need to climb to reach it. There’s 306 steps, with the scales of snakes acting as the handrails on either side. The temple itself is a sacred place for many Thai people, and it remains an active place of worship.
Other popular places in Chiang Mai is Doi Inthanon National Park, home to Thailand’s highest mountain and Sticky Waterfalls – where you’re able to walk up a waterfall due to the stones grippy texture.
Where to stay in Chiang Mai
I stayed at the Travelodge Nimman which is a really modern, clean hotel with excellent amenities. There’s an amazing rooftop pool and bar, a gym, and a restaurant. It’s located just a short walk away from the Nimman neighbourhood, which has loads of independent shops, cafes and restaurants.
Chiang Rai – 3 days
Chiang Rai is another town in Northern Thailand, known for its incredible temples and surrounded by beautiful countryside. It’s smaller and more laid back than Chiang Mai, and definitely shouldn’t be missed on your 1 month Thailand itinerary.
There’s a direct bus from Chiang Mai to Chiang Rai that takes 3 hours 45 minutes.
Day 1
The temples in Chiang Rai are typically much newer than other temples in Thailand. The most famous temple in Chiang Rai, Wat Rong Khun (the white temple), was built in 1997, and Wat Rong Suea Ten (the blue temple) was built in 2016. Compared to the centuries old temples in Chiang Mai, their design is much more contemporary and grand.
Head to Wat Rong Khun as soon as it opens (8am) to avoid the crowds, as it gets very busy here. The temple is completely white, chosen to represent the purity of Buddha, and it’s an incredible spectacle.
Next, visit Wat Rong Suea Ten, with its huge white Buddha statue inside. Finally, stop at The Blak House (Baan Dam) a unique art museum created by the Thai artist, Thawan Duchanee. The collection of around 40 buildings is made up of animal skin, bones and dark images.
Day 2
Rent a scooter and head out into the countryside around Chiang Rai. There’s some incredible coffee shops with views over the mountains like Akha Farmville, Phu Phop Kham, Myo Cafe, and the Choui Fong Tea plantation.
Day 3
About 1 hour North of Chiang Rai you’ll find the Golden triangle where the borders of Thailand, Myanmar and Laos meet. If you’re on a scooter, the drive will take a lot longer as they can’t go very fast, and the roads are quite busy, so this highly rated tour might be a better option.
You’ll first visit Wat Rong Khun, then head to Golden Triangle and the House of Opium, where you’ll learn about the how opium was illegally traded through the three borders.
Where to stay in Chiang Rai
I stayed at MORA Boutique hotel, and I can’t recommend it enough. There’s a stunning swimming pool, gym, excellent restaurant and a rooftop bar. The rooms are beautifully finished, with showers and separate bath tubs, and a private balcony. It’s well located for exploring Chiang Rai and there’s plenty of parking if you decide to rent a scooter.
Tips for planning your Thailand one month itinerary
Sort your international driving license before you arrive
Scooters are the most popular modes of transport in Thailand, and you need an international driving license to ride one.
Although you probably won’t be asked for it at the hire place, if you get stopped by the police they’ll want to see it.
If you’re in the UK, you can get one in less than 10 minutes by taking your driving license and a passport photo into a post office branch.
Make sure you have travel insurance
You can never predict what might happen whilst you’re in Thailand, so having travel insurance is essential.
I use SafetyWing for my travel insurance – their online dashboardkeeps your documents in one place so they’re easy to find if you need them, you can add extras such as technology cover, children under 10 are free of charge and you can even start the policy when you’re already on a trip (a lot of companies don’t let you do this).
Know the rules with your visa
If you’re travelling from the UK or the US, you can stay in Thailand for up to 30 days without needing a visa. If you stay for longer, you’ll need to pay 500THB for each day you overstay. If you do want to stay for more than 1 month, go to your nearest immigration office to apply for a 30 day extension.
I’ve written a full guide that covers everything you need to know about Thailand visas, and what happens if you overstay.
