Snorkeling Koh Lanta: 4 islands with Emerald Cave swim

Swim through an 80-meter tunnel into a lagoon ringed by rainforest

A full-day snorkeling trip from Koh Lanta visits Koh Mook, Koh Kradan, Koh Chuak and Koh Ngai on a speed boat with a professional English-speaking guide. You swim through the Emerald Cave's dark tunnel with headlamps, snorkel at two coral reef sites, eat Thai lunch on the beach, and relax between stops. Hotel pickup or meeting at Saladan Pier is your choice. The boat carries 35 passengers maximum. The tour runs 7.5 hours and includes snorkeling gear, life jacket, lunch, water and fruit.

Step-by-step itinerary

Stops and time at each

1. Emerald Cave1h
2. Koh Kradan1h 30m

Four Islands and Emerald Cave Tour

• Pickup from hotel on Koh Lanta
• Cruise by speed boat to Koh Mook
• Swim through Emerald Cave tunnel
• Snorkel at Koh Kradan coral reef
• Enjoy Thai buffet lunch on Koh Kradan
• Relax and sunbathe on Koh Kradan beach
• Snorkel at Koh Chuak
• Relax and walk around Koh Ngai
• Return to Koh Lanta by speed boat
• Transfer back to hotel on Koh Lanta

The experience

The boat leaves Koh Lanta between 8 and 9 in the morning (either picked up from your hotel by truck or collected directly from the beach by speed boat), and reaches Koh Mook in less than 30 minutes. The Emerald Cave is the centerpiece: you put on a life jacket and headlamp, then swim through an 80-meter tunnel in near darkness until daylight breaks through and opens onto a 360-degree lagoon enclosed by rainforest walls. The crew stays with the group the whole way through.

After the cave, the boat anchors at Koh Kradan for the first snorkel stop in shallow coral reef, then pulls ashore for a Thai buffet lunch served on the beach. You get an hour to eat, walk along the sand, or wade in the shallows before heading back out. The second snorkel site is Koh Chuak, a small island with its own reef system and fish. The final stop is Koh Ngai, where there are no roads or shops, only a quiet beach to walk and rest before the return journey. You're back at your hotel by mid-afternoon.

The speed boat holds 35 people maximum, which keeps the group manageable at the cave and the reef sites. A professional guide speaks English and Thai throughout. Snorkeling equipment, life jackets, drinking water and fresh fruit are all provided. You bring only a towel and sunscreen. The tour is subject to change if weather or sea conditions shift, and a minimum of 15 passengers is required to run.

What’s included

• Professional English-speaking guide and basic accident insurance.
• snorkeling gear and life jacket for every passenger.
• Thai buffet lunch on Koh Kradan beach.
• drinking water and fresh fruit throughout the day.
• hotel round-trip transfer (if you choose that pickup option).

Before you book

Days and timesEvery dayDeparts at 09:00

AgesAdult (12 to 70 years) · Child (4 to 11 years) · Infant (3 years): free · Under 3: can't be included in the booking

Meeting point and pickupHotel pickup is optional; you can also go straight to the meeting point. Ends back at the starting point.Operator's directions: “Meet at Saladan Pier at least 30 minutes before scheduled departure.”

Cancellation and refundsFree cancellation up to 24h 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 yesterday

Good to know

Easy physical levelNot for pregnant travelersNot for heart conditionsNot for back problemsInfants must sit on laps

Operated by Trip Store Krabi

Is this one for you?Book this if you want snorkeling, cave swimming, and island stops combined in one full day. The speed boat format lets you move efficiently between sites, though it requires 15 people minimum so confirm availability early in your trip.

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Top questions

What languages is the guide in?

Live guide in English and Thai.

Can children come?

Yes. Ticket types: Child (4 to 11 years); Infant (3 years): free. Under 3: they can't be included in the booking.

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 24h before the start.

What is the Emerald Cave like when you swim through it?

The Emerald Cave is an 80-meter tunnel running through Koh Mook that you swim through with a headlamp in the group. Daylight streams in as you emerge into a hidden lagoon surrounded by a 360-degree rainforest wall rising into the clouds. The lagoon is pristine and protected inside the island.

How many times do you get in the water to snorkel?

You snorkel twice: once at Koh Kradan in shallow coral reef, and again at Koh Chuak, a small island with its own reef system and sea creatures. The Emerald Cave swim is separate and happens first.

What's included in the lunch, and where do you eat it?

Lunch is a Thai buffet served on the beach at Koh Kradan after the first snorkel stop. You have an hour to eat, rest and walk along the sand before the boat heads to the next site.

Can I choose where to meet the boat on the morning of the tour?

Yes, you can arrange hotel pickup from your accommodation on Koh Lanta, meet at Phra Ae Public Health Park, or meet directly at Tin Adventure's office in Saladan Pier at 7:50 am. The choice is yours at checkout.

How long is the whole day, and what time do you return?

The tour runs 7.5 hours from pickup to drop-off. Hotel pickup starts between 8 and 9 am, and you're back at your hotel by 4:30 pm, giving you the rest of the afternoon free.