Rainbow Reef at Koh Nang Yuan offers an accessible shore entry for both divers and snorkellers. The site features a shallow reef structure ranging from 1 to 6 metres in depth, with an average of 3 metres. Visibility varies between 5 and 25 metres, and water temperatures remain warm throughout the year. Divers and snorkellers can observe species including sling-jaw wrasse, longfin bannerfish, golden butterflyfish, blue-barred parrotfish, rock cod, rabbitfish, scissortail sergeant, moon wrasse, barred soapfish, and long-spined sea urchin. While currents are generally mild, they can strengthen unexpectedly. Visitors should be cautious of sharp coral in the shallows and avoid contact with the reef structure.

Junkyard is an artificial reef located 500 metres off Koh Nang Yuan. This site features a mix of structures and wrecks, offering a varied topography that reaches depths between 3 and 32 metres, with an average depth of 9 metres. Divers can encounter wrasses, rabbitfish, rock cod, golden butterflyfish, sling-jaw wrasse, pink skunk anemonefish, coral trout, longfin bannerfish, barred soapfish, scissortail sergeant, sea cucumbers, snails, and long-spined sea urchins. Conditions are generally mild, though visibility fluctuates between 2 and 30 metres. Access is by boat only. The site is suitable for beginners and supports night diving, with water temperatures ranging from 27 to 31 degrees Celsius.

Ban's Artificial Reef at Koh Nang Yuan is a diverse artificial reef and coral transplant site featuring a wide array of submerged structures. Divers can explore a buoyancy obstacle course, a school house, and various sculptures including a whaleshark, a turtle, rays, and farm animals, alongside sunken vehicles. The site offers depths ranging from 2 to 40 metres, with an average depth of 8 metres. Suitable for beginners, the site experiences mild currents and visibility between 5 and 30 metres. Access is available by both shore and boat. Facilities include equipment rental, air fills, and rinse stations, making it a well-supported location for divers.

Dive Supply at Koh Nang Yuan features a combination of reef and pinnacle topography suitable for beginner divers. Accessible via shore entry, the site offers depths ranging from 5 to 28 metres with an average of 16 metres. Currents are generally mild, though visibility fluctuates between 5 and 20 metres. Water temperatures remain warm, typically between 28 and 31 degrees Celsius. The site is also open for night diving, which allows for observation of different nocturnal behaviours. Divers should maintain neutral buoyancy to avoid contact with sharp coral and rocks, and remain aware of potential jellyfish in the water.

Three Rocks is a reef and pinnacle site located 800 metres off the coast of Koh Nang Yuan. The site is suitable for beginners, with an average depth of 5 metres and a maximum depth of 14 metres. Divers can expect mild currents and visibility ranging from 2 to 30 metres. Marine life recorded at the site includes wrasses, sling-jaw wrasse, triggerfish, Jorunna nudibranch, longfin bannerfish, rock cod, golden butterflyfish, pink skunk anemonefish, rabbitfish, long-spined sea urchin, Caribbean barrel sponge, barred soapfish, scissortail sergeant, and sea cucumber. Access is by boat only. Be aware of boat traffic and sea urchins in the area. Night diving is permitted.

OneStopDive is a pinnacle and reef site located 5000 metres from Koh Nang Yuan. This site offers a depth range of 14 to 40 metres, with an average depth of 22 metres. Divers must access the site by boat. Conditions include moderate currents and visibility ranging from 5 to 40 metres. Water temperatures remain between 28 and 30 degrees Celsius throughout the year. The site is suitable for intermediate divers, with night diving options available. Hazards include boat traffic, strong currents, and the risks associated with deep diving, such as nitrogen narcosis. Divers should deploy a surface marker buoy before ascending and monitor conditions closely due to potential current shifts.

Sairee Reef, located off Koh Nang Yuan, provides a shallow, accessible environment for beginner divers. The site features depths between 5 and 12 metres, averaging 8 metres, with mild currents. Visibility varies from 5 to 25 metres. Divers can observe wrasses, which are common, alongside uncommon species including golden butterflyfish, longfin bannerfish, blue-barred parrotfish, coral trout, pink skunk anemonefish, rock cod, rabbitfish, sergeants, hard coral, and snails. Entry is from the shore, though divers must navigate a shore break and watch for active boat traffic. Using a surface marker buoy is recommended for safety. The site is suitable for night diving, with water temperatures consistently ranging from 28C to 31C.

Hin Pee Wee is a pinnacle and reef site located 2000 metres from the shore of Koh Nang Yuan. The topography consists of a primary pinnacle starting at 9 metres and descending to a maximum depth of 28 metres, surrounded by scattered large rocks. Divers should be prepared for moderate currents and visibility ranging from 5 to 30 metres. A thermocline is often present near 18 metres. Due to the depth and potential for strong currents, this site is suited for advanced divers. Access is by boat only. The site is suitable for deep, photography, and technical training dives.