Go Dive Lanta offers dedicated snorkelling trips by both speedboat and Big boat to many islands within Ko Lanta's National Marine Park. You can visit Ko Rok by Speedboat for superb snorkelling with fantastic visibility and superb coral quality. There is a 4-Island Tour by Traditional Longtail Boat that visits the islands of Ko Ngai, Ko Wan, Ko Mook (Emerald Cave), and Ko Chuek.