🔄 Updated 21 Jun 2026
Let's be straight first: Koh Larn's coral isn't as stunning as the Andaman side, like the Similans or Koh Lipe. But the upside is that it's close and easy to reach. From Bangkok it's about a 2-hour drive to Pattaya, then roughly 40–45 minutes on the boat from Bali Hai Pier to the island. It suits anyone who wants to try snorkeling on a day trip, or stay a relaxed night or two. On a clear, calm day the water turns transparent and you really can look down and see coral and schools of fish.
Snorkeling spots you can reach on your own
Koh Larn has several beaches, but only a few are good for walking straight in from the sand to snorkel. The key is the rocky headlands at the ends of each beach, where the coral and fish like to gather, rather than the open stretches of sandy bottom in the middle.
Off Samae Beach (rocky headland)
Samae is the island's second-largest beach, on the west side, with fewer people than Tawaen and a more laid-back feel. The good snorkeling sits along the rocks at the southern headland — swim out just a little and you start to see fish and shallow coral. It's great for beginners because you can walk straight in from the shore.
Tien Beach
A lot of people say the water off Tien Beach is the clearest on the island. It's a small, quieter beach that works well for both swimming and surface snorkeling to watch the fish. There's little accommodation here, so it stays uncrowded — though that also means a songthaew ride across the island to get there.
Rocks below Monkey Hill (off Tawaen Beach)
Below Monkey Hill near Tawaen Beach there's a stretch of rocks with coral, tropical fish, and the occasional starfish. But Tawaen is busy and full of jet skis and banana boats, so watch out for boat traffic and check the spot carefully before you get in.
Straight talk
Koh Larn's water clarity depends heavily on the weather. On windy days or after heavy rain the sea turns murky and you won't see much. If you're set on snorkeling, check the wind and wave forecast first, and aim for November–April when the sea is calmer — your odds of clear water are much higher.
Want more out of Koh Larn? Book tours & activities
Booking online ahead on Klook or GetYourGuide is usually cheaper than the gate and skips the queue. Pick only the experiences you actually want — prices and availability are shown live on each site.
Snorkel boat trips off Koh Sak
If you want to snorkel coral more seriously than just wading in from a beach, the popular spot is the water off Koh Sak, a small island near Koh Larn. Boats take you out and anchor in open water so you can drop in and snorkel the surface. The price is around 200 THB per person, the same for children and adults, and each trip runs about 1–2 hours. Most boats provide life jackets, mask and snorkel, lockers for your things, and some even have a slide off the back. Trips usually run mid-morning and afternoon — for example 9:00 / 12:00 / 14:00.
- Rough price — a snorkel boat trip to see coral is about 200 THB/person (same for kids and adults). Confirm on the spot; prices shift with the season and the boat owner.
- What's provided — life jackets, snorkel mask, breathing tube, lockers; some boats have a slide.
- Departure times — most run several trips from morning to afternoon, leaving once there are enough people. Ask at the pier or the shops on the beach.
- Good for — even weak swimmers can join since you wear a life jacket and staff keep an eye on you, but do tell them if you can't swim.
Check safety before you board
Make sure there are enough life jackets and that they're in good shape, ask how many people are on each trip so it isn't overcrowded, and if there are watersports like jet skis or banana boats, always ask the price clearly before you ride — that way there's no dispute when you pay.
Gear to pack and what you can rent
Snorkeling on Koh Larn doesn't take much prep. There's gear to rent on the island, but bringing your own is more comfortable and cleaner. Renting a mask and snorkel on the island runs around 100–200 THB.
- Mask + snorkel — rent on the island for 100–200 THB, or bring your own for a better fit and no leaks.
- Life jacket — provided if you go by boat. If you're wading in from the beach and aren't a strong swimmer, get one to wear.
- Rubber or water shoes — protect against cuts from rocks and sea urchins; a big help when getting in over the rocky headlands.
- Reef-safe sunscreen + sun shirt — fewer chemicals in the sea, and protection from the very strong midday sun.
- Dry bag — for your phone and wallet, to keep them dry on the small boats.
When the water is clear and worth the trip
Visibility at Koh Larn usually runs around 5–15 meters, and on a good day you can see plenty. The best window is the dry season, roughly November to April, when the sea is calm and the skies are often clear. February to April is peak season — a bit more crowded, but the water looks great. On any given day, go in the morning: the boats aren't packed yet, the water hasn't been churned up by watersports, and the sun isn't at its harshest.
Weekends get very busy
On weekends and long holidays the boats at Bali Hai are packed and the queues are long. If you can avoid it, go on a weekday, or catch the first boat in the morning — you'll get both a spot on the beach and water that's still clear before the crowds get in.
Getting to Koh Larn
- Regular passenger ferry — from Bali Hai Pier in South Pattaya, 30 THB/person, about 40–45 minutes, landing at Na Baan Pier or Tawaen Beach Pier. Several trips run from morning to evening.
- Speedboat — about 15 minutes, much pricier, starting in the low hundreds per trip. Good if you're in a hurry or traveling as a group.
- On the island — there are songthaews and motorbike rentals (around 300 THB/day) for crossing over to other beaches like Samae or Tien.
Help protect the island
Shallow coral is fragile, so don't step on it or touch it, don't feed the fish, and carry every bit of your trash back to shore. Koh Larn gets a lot of visitors — if everyone does a little, the sea will still be here for the next generation to enjoy.
Plan a full day on Koh Larn
See the Koh Larn travel guide →