Koh Bok is best known for its amazing underwater marine life. Manta Rays are often seen here, especially in March. There are two main diving areas, which are the ridge/bay (suitable for all levels of scuba diver) and Koh Bon Pinnacle, which is deep and prone to currents, and therefore only suitable for experienced scuba divers.
The island has no beach, and is most-commonly visited by scuba diving liveaboard boats which off Similan diving tours from Khao Lak or Phuket. It’s also suitable for one-day tours for scuba diving, but only from Khao Lak. Snorkelling at Koh Bon is possible, but snorkellers are more likely to enjoy the Similan Islands.