Koh Samui, Koh Phangan & Koh Tao: Gulf Islands Guide

The Gulf of Thailand holds three of the country's most loved islands, each with a completely different personality. Koh Samui is the polished resort island with an international airport, Koh Phangan is famous for its monthly Full Moon Party (and a surprisingly serene side away from the beach raves), and tiny Koh Tao is one of the cheapest places on earth to learn to scuba dive. This guide walks you through how to reach them, what to do on each, when to go, and how to hop between all three.

Unlike the Andaman islands on Thailand's west coast, the Gulf islands sit close together off the east coast near Surat Thani, which makes a multi-island trip refreshingly easy. Crucially, their best weather window runs roughly opposite to the Andaman side, so understanding the seasons here can make or break your trip.

Getting to the Gulf Islands

There are two broad ways in: fly straight to Koh Samui, or fly to the mainland and take a ferry. Your choice usually comes down to budget and which island you're heading to first.

Flying into Koh Samui

Koh Samui has its own boutique airport (USM), with its open-air, garden-style terminal that feels more like a resort lobby than an airport. It's served mainly by Bangkok Airways, with some Thai and regional connections. Flights are quick and convenient but tend to be noticeably pricier than flying into the mainland, partly because the airport is privately operated and slots are limited. If your priority is landing on Samui in the early afternoon and being on a beach by sunset, it's worth the premium.

Ferries from Surat Thani and Chumphon

The budget-friendly route is to fly (or take an overnight train or bus) to Surat Thani on the mainland, then connect to a pier and catch a ferry. Operators such as Lomprayah, Seatran and Raja run combined bus-and-boat or catamaran services. From Surat Thani you can reach Koh Samui in roughly 1.5 to 2.5 hours depending on the boat, with onward services to Koh Phangan and Koh Tao.

If you're coming from the north (for example after Bangkok or Hua Hin), the Chumphon gateway is the natural jumping-off point for Koh Tao, since the high-speed catamaran from Chumphon reaches Koh Tao in around 1.5 to 2 hours. Many travellers ride the overnight train from Bangkok to Chumphon, then step almost straight onto a morning boat.

Ferry schedules and the last sailing of the day shift with the season and the weather, so it pays to check timings the night before. Pre-booking your boat-and-transfer combo and pulling up the live schedule is far easier with a working connection the moment you land. If you sort a Thailand eSIM plan before you fly, you can confirm departures and arrange your pier pickup without hunting for airport Wi-Fi.

Koh Samui: Beaches, Waterfalls and Everything In Between

Koh Samui is the largest and most developed of the three, ringed by a single main road that loops the island. It suits almost everyone: families, couples, digital nomads and first-time island-goers who still want comfort, restaurants and reliable services.

Chaweng and Lamai

Chaweng is the island's main hub: a long, bright stretch of sand backed by a busy strip of restaurants, bars, malls and nightlife. It's lively and a little touristy, but the beach itself is genuinely beautiful and the swimming is good. Lamai, just to the south, is Samui's second-busiest beach. It has a more relaxed feel than Chaweng while still offering plenty of dining and a decent nightlife scene, which makes it a popular middle-ground.

Quieter corners

If you want to slow down, look to the north and southwest. Bophut is home to the charming Fisherman's Village, a cluster of restored wooden shophouses now filled with boutiques and waterfront restaurants, especially atmospheric during its weekly walking-street market. Maenam and Lipa Noi are calmer, more local-feeling beaches that work well for travellers seeking peace over party.

Beyond the beach

Na Muang Waterfalls: two inland falls in the island's jungly interior, with the upper fall being the more dramatic of the pair.
Big Buddha (Wat Phra Yai): a towering golden seated Buddha on a small islet in the northeast, one of Samui's most recognisable landmarks.
Hin Ta and Hin Yai: the famously suggestive "Grandfather and Grandmother" rock formations near Lamai.
Ang Thong Marine Park: an archipelago of dramatic limestone islands reachable on a day tour from Samui, great for kayaking and viewpoints.

Koh Phangan and the Full Moon Party

Koh Phangan sits just north of Samui, a short ferry ride away, and lives a double life. To most of the world it means the Full Moon Party, but the island is also home to some of the Gulf's most laid-back beaches, wellness retreats and yoga studios. You can absolutely visit Phangan and never go near a bucket of cheap spirits.

What the Full Moon Party actually is

The Full Moon Party is a beach rave held on Haad Rin beach roughly once a month, timed to the full moon (though dates occasionally shift around major Buddhist holidays). Tens of thousands of travellers gather for an all-night party of fire shows, neon body paint, beachfront sound systems and dancing until sunrise. There's a small entry fee to access the beach on the night.

If your trip revolves around the party, check the published dates well ahead, because accommodation on and around Haad Rin books out and prices spike sharply in the days surrounding it. Around the main event you'll also find Half Moon and other jungle parties filling the calendar.

Staying safe at the party

The party is a huge part of the backpacker trail, but it does come with real risks worth respecting:

Watch your drinks. The infamous "buckets" are very strong; pace yourself and don't leave a drink unattended.
Wear shoes. Broken glass and fire skipping ropes on the sand cause a steady stream of injuries every month.
Mind the sea. Don't swim drunk; the combination of alcohol and dark water is dangerous.
Keep valuables minimal. Take only what you need and agree a meeting point with friends in case phones die.

For a fuller rundown of common pitfalls across the country, our Thailand safety guide covers scams, scooter risks and health precautions in depth. In a crowd of tens of thousands, it's easy to get separated, so keeping your group chat alive and being able to drop a live location is genuinely useful. Reliable data on a Thai eSIM means you can call a ride or regroup even when the beach is chaos.

The other side of Phangan

Away from Haad Rin, Phangan rewards slow travel. The north and west coasts, around Chaloklum, Haad Salad and Haad Yao, are calm and scenic. The island has become a hub for yoga, meditation and wellness retreats, and the viewpoint hikes and the Than Sadet waterfalls show off its jungle interior. Many couples and solo travellers come here purely to unwind.

Koh Tao: Thailand's Diving School Island

Tiny Koh Tao (literally "Turtle Island") sits north of Phangan and punches far above its size. It is one of the world's most popular and affordable places to earn a scuba certification, thanks to warm, generally calm water, abundant dive schools and an established budget-traveller scene.

Learning to dive

Koh Tao is packed with dive centres offering entry-level Open Water certification courses, typically run over three to four days. The high concentration of operators keeps prices competitive and the vibe social, so it's common to arrive solo and leave with a whole group of dive buddies. Popular dive sites around the island include Chumphon Pinnacle, Sail Rock (shared with Phangan) and Shark Bay, where you may spot blacktip reef sharks and the occasional whale shark in season.

Even if you're not certified, the snorkelling is excellent. Shark Bay and Tanote Bay are easy to reach and full of life, and you can join a snorkelling boat trip that loops the island's best spots.

Beyond diving

Koh Nang Yuan: a postcard-perfect trio of islets joined by a sandbar, just off Koh Tao's coast and reachable by a short boat hop. The viewpoint here is one of the most photographed in Thailand.
Viewpoints: short but steep hikes such as John-Suwan and Mango Viewpoint deliver sweeping views over the bays.
Sairee Beach: the main strip, with the bulk of the island's accommodation, restaurants and gentle nightlife.

Koh Tao is small and roads are rough and hilly, so many visitors get around by water taxi or on foot rather than renting a scooter. If you do ride, take the same care you would anywhere in Thailand.

Best Time to Visit the Gulf Islands

This is the single most important thing to get right. The Gulf islands run on a different weather cycle from the Andaman coast (Phuket, Krabi, Phi Phi). While the Andaman side is at its driest from roughly November to April, the Gulf islands tend to be at their best a little differently:

February to April is generally the driest, sunniest window for Koh Samui, Koh Phangan and Koh Tao, with calm seas ideal for diving and island hopping.
Late October to December is the Gulf's wettest stretch, when the northeast monsoon brings heavier rain and rougher water; ferry crossings can occasionally be cancelled in bad weather.
The shoulder months either side still see plenty of good days and fewer crowds.

This opposite-monsoon quirk is genuinely useful for trip planning: if you're visiting Thailand during the Gulf's rainy spell, you might flip your itinerary toward the Andaman coast, and vice versa. Our deep dive on the best time to visit Thailand breaks down the seasons region by region, and if you're still deciding between coasts entirely, compare them in our guide to Thailand's best islands.

Island-Hopping Between Samui, Phangan and Tao

One of the joys of the Gulf is how easily the three islands connect. High-speed catamarans and ferries link them daily, and a popular route runs Koh Samui → Koh Phangan → Koh Tao (or the reverse), letting you string all three together in one trip.

Rough hopping times to expect:

Koh Samui to Koh Phangan: around 30 minutes to an hour by fast boat.
Koh Phangan to Koh Tao: roughly 1 to 1.5 hours.
Koh Samui to Koh Tao: typically 1.5 to 2 hours, sometimes via Phangan.

A sensible plan for a week or so might be a few nights of comfort and beaches on Samui, a stop on Phangan (timed to the Full Moon Party if that's your thing, or for wellness if it isn't), and two to three nights learning to dive or relaxing on Koh Tao. Then continue from Surat Thani or fly out of Samui.

Booking tips for ferries

Buy the day before in peak season, especially around the Full Moon Party, when boats fill up.
Travel light if you can — schlepping big bags across piers and beaches gets old fast.
Allow buffer time for onward flights; sea conditions can delay departures.
Keep tickets and confirmations saved offline on your phone in case signal drops at the pier.

Ferry operators increasingly let you book, pay and show e-tickets through apps, and pier pickups are often arranged by message, so a stable connection smooths the whole journey. With a Thailand eSIM active from the moment you land, you can compare boat times, ride-hail to the pier, message your guesthouse and pull up offline maps without ever swapping a SIM between islands. The Gulf may be famous for its parties and its diving, but staying effortlessly connected across all three islands is what turns a good trip into a smooth one.

Frequently Asked Questions

How do I get to Koh Samui, Koh Phangan and Koh Tao?

Koh Samui has its own airport (USM), served mainly by Bangkok Airways, so you can fly in directly. The cheaper route is to fly, train or bus to Surat Thani (or Chumphon for Koh Tao) on the mainland and take a catamaran or ferry with operators like Lomprayah, Seatran or Raja. All three islands are linked by daily boats, making it easy to hop between them.

When is the Full Moon Party on Koh Phangan?

The Full Moon Party is held on Haad Rin beach roughly once a month, timed to the full moon, though the date occasionally shifts around major Buddhist holidays. Accommodation near Haad Rin books out fast and prices rise sharply around the event, so check the published dates and reserve well in advance if your trip depends on it.

Is Koh Tao a good place to learn to dive?

Yes. Koh Tao is one of the world's most popular and affordable places to get scuba certified, thanks to warm, generally calm water and a high concentration of dive schools. Entry-level Open Water courses usually run over three to four days, and the competitive, social scene means many travellers arrive solo and leave with a group of dive buddies.

What is the best time to visit the Gulf islands?

The Gulf islands run on a different cycle from the Andaman coast. February to April is generally the driest and sunniest, with calm seas ideal for diving and island hopping. Late October to December is the wettest stretch, when the northeast monsoon brings heavier rain and rougher water, and ferries can occasionally be cancelled in bad weather.

Can I visit all three Gulf islands in one trip?

Easily. Fast boats link Koh Samui, Koh Phangan and Koh Tao daily, with hops of roughly 30 minutes to two hours between them. A common route is Samui for beaches and comfort, Phangan for the Full Moon Party or wellness, and Koh Tao for diving, then onward via Surat Thani or a flight out of Samui. Book ferries a day ahead in peak season.