Koh Samui Thailand

Koh Samui is a beach-resort base in the Gulf of Thailand that doubles as a launchpad to three very different underwater days: Koh Tao's training-friendly reefs and pinnacles, the open-ocean pelagic magnet of Sail Rock, and the shallow reef mosaics of Mu Ko Ang Thong National Marine Park. Water temps hover around 28°C to 30°C, so most divers live in a 3mm suit or rashguard. The best marine conditions are typically March-September, while late October to mid-December often brings rougher seas and more rain. On days off, combine Fisherman's Village night markets, temple stops at the Big Buddha and Wat Plai Laem, jungle waterfalls, and serious wellness at the island's spas and yoga studios. New nationwide coral-protection rules require briefings, supervision, and strict no-touch behavior in reef zones, so choosing a licensed operator is part of the experience.