Green Group Travel
Description
Emerald Cave is the headline here: a swim through Koh Mook’s dark limestone passage into its enclosed beach, with a waterproof bag for phones. Green Group Travel runs shared longtail trips around Koh Chuek, Koh Kradan, Koh Mook and Koh Ngai, plus private boats for smaller island plans.
The private longtail option is the smart pick for couples or small groups who want more beach and snorkel time, especially around Koh Ngai. A cooked lunch, water and soft drinks are included, and the longtail ride has more character than a speedboat – plus the engine provides a free lesson in why earplugs were invented.
Koh Chuek and Koh Kradan deliver the reef stops; Koh Ngai supplies the broad beach and a bar for a post-swim drink. Sea conditions decide whether Emerald Cave and every planned island are reachable, so treat the route as an island circuit.
Shared boats put everyone on one timetable, while a private charter lets you drop the cave and stay longer in the water. Ask for Ya or Yok as guide if you can; both know how to keep a longtail day moving without turning it into a military amphibious exercise.
Highlights
- Emerald Cave swim includes a waterproof phone bag
- Private charters allow a shorter, snorkel-and-beach-focused island plan
- Cooked lunch, drinking water and soft drinks are included
- Shared longtail boats follow a fixed group timetable
- The longtail engine is loud and fumes reach the seating area






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