The document discusses popular scuba diving locations throughout Thailand. It recommends the Similan Islands as the top destination, located off the coast of Phuket, with affordable liveaboard trips available. Nearby Koh Lak is also mentioned as offering good diving and snorkeling. Other recommended locations include Ko Rang Nok, Koh Phota, Ko Racha Yai, Krabi, Samui, Ko Tao, and the Angthong Marine Park. Bangkok-based diving courses are also discussed as a more affordable option for those unable to travel farther.