Koh Lanta 4 Islands and Emerald Cave Speedboat Tour
Activity provider: Trip Store Krabi
Reviewed Nov 2026
Highlights
- Swim through the tunnel into the Emerald Cave lagoon on Koh Mook
- Snorkelling off Koh Kradan
- Thai buffet lunch on the beach
- Snorkel stop at Koh Chuak
- Beach time on Koh Ngai
- Free cancellation
- Instant confirmation
This speedboat day from Koh Lanta covers four islands to the south, with the Emerald Cave on Koh Mook first. Tin Adventure Sea Tour runs it with up to 35 on the boat. Hotel pickup, a beach lunch and snorkel gear are included. National park fees are extra.
- Duration: about 7.5 hours, pickup 8am to 9am
- Group size: up to 35 (minimum 15 to run)
- Includes: hotel transfers on Lanta, guide, Thai buffet lunch, snorkel gear, life jackets, water and fruit, basic insurance
- Excludes: national park fees, tips
- Highlight: the swim through the dark tunnel into the Emerald Cave lagoon
The Route
The crossing to Koh Mook takes under 30 minutes. At the Emerald Cave you put on a life jacket and swim with the group through an 80-metre tunnel, lit by headlamps, until daylight opens onto a small beach and lagoon walled in by cliffs and forest.
The boat moves on to Koh Kradan for snorkelling over a shallow reef, then lunch on the beach and an hour to swim or lie on the sand. The afternoon brings a second snorkel stop at Koh Chuak and an hour on Koh Ngai before the run back to Lanta.
Watch out: The national park closes the Emerald Cave for part of the monsoon season each year. Check the dates on our Emerald Cave page before booking between June and September.
Who It Suits
It suits families with children over 3, snorkellers, and anyone on Lanta who wants the Trang islands in one day. It isn’t for pregnant travellers, the over-70s, or anyone with back or neck problems.
Insider Tip: Bring cash for the park fees and a dry bag for your phone. The cave swim is the one stop where everything gets wet.
Itinerary
Emerald Cave, Koh Mook
Under 30 minutes by speedboat from Lanta. In life jackets, the group swims an 80-metre dark tunnel with headlamps into a lagoon ringed by cliffs and forest.
Koh Kradan
Snorkelling over a shallow reef, then a Thai buffet lunch and free time on the beach.
Koh Chuak
Second snorkel stop, around a small island.
Koh Ngai
An hour on the beach before the boat heads back to Koh Lanta.
Included
- Hotel pickup and drop-off on Koh Lanta
- English-speaking guide
- Thai buffet lunch on Koh Kradan
- Snorkel gear and life jacket
- Drinking water and fruit
- Basic accident insurance
Not Included
- National park entrance fees
- tips
Good to know
Cancellation
For a full refund, cancel at least 24 hours before the scheduled departure time.
Before you go
Not recommended for pregnant travellers, children under 3, travellers over 70, or anyone with back or neck problems. The tour needs at least 15 people to run, and the route can change with weather and sea conditions.
