Merlin House Reef at Koh Racha Yai offers a gentle environment for both diving and snorkelling. The site features a reef structure extending from the shallows to a maximum depth of 11 metres, with an average depth of 10 metres. Entry is made directly from the shore. Conditions are generally mild, with visibility ranging between 5 and 15 metres and water temperatures consistently between 29 and 30 degrees Celsius. Divers and snorkellers should exercise caution regarding sharp coral, rocks, and sea urchins when entering the water. Guided tours and equipment rental services are available on site to assist with navigation and gear requirements.

Meridian Beach is a shore-entry reef dive located on Koh Racha Yai. The site features depths ranging from 3 to 12 metres, with an average of 7 metres, making it suitable for beginners. Divers experience mild currents and visibility between 5 and 15 metres. The reef structure supports hard and soft corals. Facilities on site include air fills and guided tours. The location is also suitable for night diving, which allows for different observations of the reef environment. When entering or exiting the water, shuffle your feet along the seabed to avoid stonefish that may be camouflaged on the bottom.

Ao Yon Beach on Koh Racha Yai offers a shallow reef environment suitable for both diving and snorkelling. The site features depths ranging from 2 to 10 metres, with an average depth of 6 metres, making it well-suited for beginners and training courses. Divers can expect mild currents and visibility between 5 and 25 metres. Entry is directly from the shore, and the site supports long dives typically lasting 60 minutes. Night diving is also available. Facilities at the location include toilets, showers, a dive shop, boat charter services, and a cafe. Be aware of potential hazards including jellyfish and sharp coral when entering or exploring the reef.

Paradise Deep Rock is a drift dive site located 5000 metres offshore from Koh Racha Yai. The topography consists of reef structures and rock faces reaching depths of 12 metres. Divers must be prepared for strong currents that require solid buoyancy control and a pre-arranged boat pick-up plan. Visibility at the site typically ranges between 10 and 30 metres, with water temperatures averaging 29 to 30 degrees Celsius, though occasional cold thermoclines occur. Due to the challenging current conditions and the presence of sharp coral on the rock faces, this site is suitable only for advanced divers.

Anemone Reef is a submerged pinnacle located 1800 metres from the shore of Koh Racha Yai. This site is accessible only by boat and features depths ranging from 5 to 30 metres, with an average depth of 18 metres. The topography consists of a reef structure that requires intermediate skill due to moderate to strong currents that can shift quickly. Visibility typically varies between 10 and 25 metres. Divers should remain close to the reef structure and utilise the sheltered side during periods of increased flow. Always surface with adequate air and deploy a surface marker buoy before ascending in this open water environment.

Staghorn Reef at Koh Racha Yai features a combination of a shallow reef top and a wall that descends to 30 metres. With an average depth of 18 metres, the site offers varied topography for intermediate divers. Access is by boat, and conditions include moderate currents and visibility ranging from 8 to 25 metres. Divers should be aware of potential surge and swell, which can push toward sharp coral. Due to the presence of sharks and currents that can strengthen quickly, maintaining good buoyancy and staying close to your group is essential. The site is best suited for those comfortable with drift diving and managing changing water conditions.

Sub Aqua at Koh Racha Yai offers a diverse underwater landscape featuring a combination of reef, pinnacle, wall, and artificial reef structures. Located 2000 metres from shore, this site requires boat access and is suited for intermediate divers. Depths range from 8 to 30 metres, with an average of 15 metres. Visibility typically spans 10 to 30 metres. Divers should be prepared for moderate currents that can strengthen quickly, requiring good buoyancy control. The site is also suitable for night diving. Facilities available include toilets, showers, and a rinse station. Water temperatures remain consistent between 28 and 30C throughout the year.

Karon Rock at Koh Racha Yai is a reef and pinnacle site featuring a boulder formation. The site ranges in depth from 6m to 19m, with an average depth of 12m. It is accessible by boat and is suitable for beginner divers, including those completing Open Water or Advanced courses. Conditions include mild currents and visibility ranging from 8m to 30m. Water temperatures remain consistent between 28C and 30C throughout the year. The site is open to night diving and is typically explored on 50-minute dives. Divers should be aware of potential hazards including boat traffic, entanglement risks, and sharp coral.