Snorkeling : Koh Lanta is also a terrific location for those who love to snorkel. Day trips can be easily arranged to go to numerous locations which are just a short boat ride away from Koh Lanta. The Four-Island Trip is a very popular tour as you get to see the beautiful islands, do some snorkeling, eat lunch on one of the beaches, and visit the wonderful Emerald Cave at Koh Mook. If you ask for the best place for snorkeling “Koh Rok” is answer, It is the combination of virgin-white powder sands and crystal clear water. Just off shore on Koh Rok is a square mile of coral reef with an underwater world waiting to captivate you.