Snorkeling Ko Lanta: 4 Islands & Emerald Cave

Four islands, one boat, an 80-meter swim into Emerald Cave

A private longtail boat snorkeling trip around Ko Lanta visits four islands in the Andaman Sea (Koh Mah, Koh Chuak, Koh Ngai, and Koh Mook) with stops to snorkel coral reefs, swim through a sea tunnel into a hidden lagoon, and eat lunch on the beach. The boat is yours alone, the itinerary flexible, and a local crew handles the route while you decide how long to stay at each site.

Step-by-step itinerary

Island hopping and snorkeling tour

• Snorkel around Koh Mah
• Explore coral reefs at Koh Chuak
• Enjoy Thai buffet lunch at Koh Ngai
• Swim through Emerald Cave tunnel

The experience

The day starts with snorkeling at Koh Mah, where sea anemones and tropical fish move through calm, gentle currents. A straightforward introduction if you're new to the mask and fins. From there the boat moves to Koh Chuak, a remote and quiet spot where the coral reefs are dense enough that you'll spend the time just watching what swims past. Lunch is a Thai buffet served on the beach at Koh Ngai, with soft drinks and fruit, and the afternoon is yours: sunbathe, swim again, or walk the shore while the crew waits.

The Emerald Cave, Morakot in Thai, is the reason most people book this trip. You swim into an 80-meter sea tunnel carved through limestone, and when you emerge inside, the lagoon glows with reflected green light from the high cliffs that ring it. The beach inside is white sand and empty. It's a single moment, but it's the one people remember.

Because the boat is private, there's no schedule to keep and no group to wait for. You choose how long to linger at each island, and the crew (locals who know the reefs and the tides) adjust the route if the conditions or your interest shift. Life jackets and snorkeling gear are provided, along with basic accident insurance. Hotel pickup is included, so you don't arrange transport to the pier.

What’s included

• Life jacket and snorkeling mask.
• Thai buffet lunch with soft drinks and fruit on the beach.
• hotel transfer.
• basic accident insurance.

Options for this experience

4 options

For 1-2 PersonUp to 2 per booking · 09:00Lasts 7 hours, pickup is included

For 3-5 PersonUp to 5 per booking · 09:00Lasts 7 hours, pickup is included

For 6-10 PersonUp to 10 per booking · 09:00Lasts 7 hours, pickup is included

For 11-15 PersonUp to 15 per booking · 09:00Lasts 7 hours, pickup is included

You'll see the exact price of each option when you check availability.See dates and prices

Before you book

Days and timesEvery dayDeparts at 09:00

Book up to10h before

GroupPrivate

Meeting point and pickupHotel pickup is optional; you can also go straight to the meeting point. Ends back at the starting point.

Cancellation and refundsFree cancellation up to 24 h before the start. After that, no refund.It may be canceled due to bad weather or if the minimum number of travelers isn't reached. If that happens, you're offered another date or a refund.

Prices and times updated 6 days ago

Good to know

Low physical effortPublic transport nearbyNot recommended during pregnancyNot recommended with heart problems

Operated by Siam Scape Journeys

Is this one for you?Choose this if your group wants to control the pace at each island and spend as much time as you want in Emerald Cave. The private boat means no other groups and no fixed schedule.

Traveler reviews

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Top questions

What happens if it rains?

It may be canceled due to bad weather. If that happens, you're offered another date or a refund. Free cancellation up to 24 h before the start.

What's the water like for snorkeling around these four islands?

Koh Mah has calm, gentle currents and colorful sea anemones with tropical fish, making it easy for beginners. Koh Chuak's waters are clear and remote, with vibrant coral reefs and minimal crowds. Both sites stay shallow enough that you control your time in the water.

How do you actually get into Emerald Cave?

You swim through an 80-meter sea tunnel that opens into a hidden lagoon enclosed by high limestone cliffs. The tunnel is the only way in, and the lagoon inside has a soft white beach and glows with emerald light reflected off the rock.

Can you choose how long to stay at each island?

Yes. Because the boat is private, the itinerary is flexible. You decide how long to snorkel at Koh Mah or Koh Chuak, how much time to spend on the beach at Koh Ngai, and when to move to the next stop. The crew adjusts the route to match your pace.

What's included in the price?

Life jacket, snorkeling mask, Thai buffet lunch with soft drinks and fruit, hotel transfer, and basic accident insurance are all included. National Park fees are separate.