There are so many beautiful places to visit in Surat Thani. But if you are a SCUBA diver or thinking about giving it a shot, I would recommend Koh Tao and Koh Nangyuan.
Koh Tao provides diving adventure for divers of all experience levels. Koh Tao burst into fame as a haven for divers and as a major training center.
The island offers more than 20 dive sites, most of them close-by (about 15-20 minutes). You can enjoy crystal clear water almost all-year-round, with visibility often exceeding 30 meters. The weather is sunny most of the time except during the Monsoon month in November.
The reefs around the island slope from about 2 to 20 meters, while off-shore pinnacles can drop to a depth of more than 30 meters. Some of the highlights you can expect underwater are sea anemones, schools of batfish, barracudas, trevallies & giant groupers. With some luck you might spot spanish mackerel, filefish, coral shrimpfish or the poisonous scorpionfish. Count yourself lucky if you see a whale shark swimming by!