A six diving that could be scheduled as your wishes from three top destinations:

Similan Islands Marine National Park: Visibility 20-40m. Depth 3-40m. The Similans can certainly lay claim to being one of Asia's top dive destinations with over 20-30 different dive sites. East-facing dive sites feature gently sloping reefs and drop-offs with impressive gardens of sea anemones, flourishing hard and soft corals, and teeming fish populations. Western dive sites is quite the opposite. Here, giant granite boulders tumble down to the seabed to depths of 40m or more. Strong currents keep the gaps between the boulders free from build-ups of sand, leading to the development of a network of tunnels, archways and caverns that provide exciting swimthroughs. The currents also provide nutrients for masses of gorgonians, crinoids, seafans and lush soft corals. Pelagic fish as whale sharks, reef sharks, mantas, eagle rays, barracudas, travellies, tuna ands jacks are frequently observed.

Hin Daeng - Hin Muang: Visibility 20-40m. Depth 3-40m. This is one of the best dive spots in Thailand (truly a world-class dive site). The 2 rocks with vertical walls dropping straight down to 50-60m are completely covered with hard and soft coral, sea fans, sea anemones and attract large school of jacks as well as fusiliers, tuna and barracuda. Hin Daeng is also perhaps the only place in Thailand where Grey reef sharks can be seen in schools of up to 15 sharks. The richness and variety of pelagic fish compares to that found at Richelieu Rock, particularly for the sight of whale shark.

Phi Phi Islands: Visibility 10-25 meters. Depth 3-26 meters. Phi Phi Islands offers numerous walls, caverns and caves, as well as shallow coral gardens and sloping reefs. Typical sights include both hard an soft coral, shellfish and many other invertabrates. Fish life is abundant and range from coral reef fish to leopard shark or whale sharks. For divers in all levels.