1. Similan Islands: Pristine waters, vibrant reefs, manta rays, whale sharks - the Similans are a diver's dream.

2. Koh Tao: Budget-friendly paradise with excellent training, stunning coral formations, and playful turtles.

3. Surin Islands: Unspoiled archipelago teeming with diverse marine life, from colorful fish to elusive dugongs.

4. Richelieu Rock: Renowned for its dramatic underwater pinnacle, whale sharks, and schooling pelagic fish. (Located near Phuket)

5. Hin Daeng & Hin Muang: Dive through swim-throughs, encounter giant manta rays, and witness vibrant coral at these Krabi pinnacles.

6. Koh Phi Phi: Maya Bay's beauty extends underwater, with colorful reefs, fascinating rock formations, and occasional leopard shark sightings.

7. Koh Lanta: Explore limestone caves, vibrant coral reefs teeming with life, and enjoy relaxed diving away from the crowds.

8. Koh Lipe: Discover vibrant soft corals, encounter playful turtles, and explore exciting shipwrecks in Thailand's southern gem.

9. Koh Chang (Elephant Island): Unveil colorful reefs teeming with fish, explore underwater pinnacles, and relax on pristine beaches.

10. Ao Nang (Krabi): Access world-class diving sites like Hin Daeng & Hin Muang, explore hidden coves teeming with life, and enjoy stunning Krabi scenery.