Sangthong Tours

Sangthong is a classic Koh Tao institution. They run the famous "Round Island" trip on a larger, comfortable wooden boat. While it can be busier than the premium tours, it is very reliable and excellent value. They have a high success rate for finding turtles because their captains know the waters perfectly. The tour includes stops at all 5 major bays, including Shark Bay and a long stop at Koh Nang Yuan.