Which Thailand island to choose comes down to vibe and season. Koh Lanta for calm and value, Koh Phi Phi for scenery and nightlife, Koh Samui for comfort and easy flights, Koh Tao for budget diving. Then let your dates pick the coast: the Andaman islands shine Nov–Apr, the Gulf islands Jan–Sep. In two weeks, stick to two islands.
Thailand has more than a thousand islands, and the choice paralyses people. The good news is that most travellers only need to weigh five or six, and the decision gets easy once you know two things: what you want from a beach, and when you are going.
Here is my honest breakdown, including which famous island I would actually skip a night on.
First, pick your coast
Before the island, choose the sea. The Andaman coast in the west (Phi Phi, Lanta, Phuket) is at its best November to April. The Gulf coast in the east (Samui, Phangan, Tao) is sunniest January to September. They run on opposite monsoons, so your travel dates already narrow the field. Trying to combine both coasts in one short trip means a lot of transit for little gain.
Koh Lanta: calm and value
My personal favourite for a relaxed trip. Koh Lanta has long, quiet beaches, family-run bungalows, a charming Old Town and a national park, all at prices well below the big-name islands. There is no airport, so you arrive by boat, which is part of why it stays mellow.
Best for: families, couples and slow travellers who want a real beach without the crowds or the party.
Koh Phi Phi: scenery and nightlife
The scenery is genuinely spectacular: soaring limestone cliffs, turquoise bays, the viewpoint hike. But I will be straight with you. The main village is crowded, loud and party-focused, and it can feel like a theme park in high season.
My advice: come for the day trips and the viewpoint, but keep it to two or three nights. For the same waters with a fraction of the crowds, base yourself on Koh Lanta or Koh Yao Noi and visit Phi Phi on a day boat.
Koh Samui: comfort and easy access
The most developed of the Gulf islands, with an international airport, so you can fly in rather than ferry. Good beaches, strong nightlife, plenty of resorts and restaurants. It is more expensive across the board, with the upscale infrastructure to match.
Best for: travellers who want comfort, easy flights and don’t mind paying for it, plus families who value the airport.
Koh Tao: budget diving
The world’s busiest place to learn to dive, certifying thousands of divers a year, at prices roughly half of what you would pay in Bali. Beyond diving it is a small, budget-friendly island with cheap guesthouses and eats. The trade-off is limited beyond the water, and the boat ride to reach it is long.
Best for: divers, backpackers and anyone chasing value.
The quieter picks
If crowds are your enemy, look beyond the headliners.
- Koh Yao Noi: in Phang Nga Bay between Phuket and Krabi, laid-back and local, with the same jaw-dropping karst scenery.
- Koh Chang: the big, forested island in the east, near Cambodia, cheaper and greener than the south’s stars.
- Koh Kood: further out and barely developed, for genuine escape.
How to choose and hop
| Island | Coast | Best for | Cost |
|---|---|---|---|
| Koh Lanta | Andaman | Calm, families, value | $$ |
| Koh Phi Phi | Andaman | Scenery, nightlife | $$$ |
| Koh Samui | Gulf | Comfort, easy flights | $$$ |
| Koh Tao | Gulf | Diving, budget | $ |
| Koh Yao Noi | Andaman | Quiet, local | $$ |
In a two-week trip, resist the urge to island-hop hard. Pick two islands on one coast and enjoy them, rather than spending half your holiday on ferries. Book ferry and joint bus-boat tickets a day ahead in high season, since popular routes sell out.
- Choose the coast first, based on your travel month.
- Koh Lanta for the best all-round value and calm.
- Keep Koh Phi Phi to two or three nights, or day-trip it.
- Fly into Koh Samui if you want to skip the long ferries.
- Two islands in two weeks beats a frantic five.
Staying connected island to island
Island-hopping runs on your phone: booking the next ferry, checking the transfer, finding the bungalow down an unmarked track. The reassuring news is that coverage is good on the main islands, reaching Koh Phi Phi and beyond, thanks to the strong AIS and TrueMove H networks.
To make the most of it, set up a eSIM for Thailande before you fly. You stay connected as you move between islands, with no local SIM to swap. Orange’s negotiated roaming agreements put you on the local 4G/5G networks, with 24/7 support and a 100% refund if you never use it.
Hop between Thai islands without losing your connection
