Sail Rock is a prominent granite pinnacle rising from the seabed near Koh Nang Yuan. This site features a vertical wall and reef topography, extending from 2 metres down to 40 metres with an average depth of 22 metres. Due to its offshore location, it is accessible only by boat. Divers should be prepared for strong currents and variable visibility ranging from 5 to 40 metres. Thermoclines are common, causing significant temperature fluctuations within the 28 to 31 degree Celsius range. Given the depth, potential for strong currents, and overhead environments, this site is suited for intermediate divers. Hazards include boat traffic, decompression risks, and sharp coral.

Samran Pinnacle is a deep-water reef structure located 7500 metres from Koh Nang Yuan. The site consists of a submerged pinnacle with depths ranging from 9 to 30 metres, averaging 25 metres. Due to the exposed location, divers must contend with strong currents, making this an advanced dive site. Access is exclusively by boat. Visibility at the pinnacle is variable, typically ranging between 5 and 25 metres. The site supports night diving, with typical dives lasting around 50 minutes. Given the depth and current conditions, this site is suited for experienced divers capable of managing open-water currents.

Construction Artificial Reef in Ang Thong Marine Park is a structured site composed of construction materials. It is suitable for beginner divers, with depths ranging from 8 to 18 metres and an average depth of 13 metres. The site features mild currents and visibility between 5 and 25 metres. Divers should be aware of sharp edges on the structure and potential entanglement hazards. Boat access is required, and the use of a surface marker buoy is recommended due to boat traffic. Species recorded around this area include wrasses, butterflyfish, groupers, and anemonefish. Water temperatures remain warm throughout the year, typically between 28 and 31 degrees Celsius.

Koh Ma in Ang Thong Marine Park features a shelving coral reef that transitions from shallow depths to black and soft corals. Divers and snorkellers can explore this site at depths ranging from 5 to 25 metres, with an average of 12 metres. The reef supports a variety of marine life, including wrasses, groupers, Copperband Butterflyfish, Golden Butterflyfish, Blacktip Grouper, and Blue-barred Parrotfish. Less frequently, visitors may encounter Blue Ringed Angelfish, Harlequin Sweetlips, Pink Skunk Anemonefish, Longfin Bannerfish, Magnificent Giant Anemone, Rock Cod, Eightband Butterflyfish, and Porcupinefish. The site is suitable for beginners, offering mild currents and visibility between 10 and 25 metres. Entry is possible by both boat and shore.

Kong Yai is a reef and pinnacle site located within Ang Thong Marine Park. Accessible only by boat from Koh Samui, the site features depths ranging from 10 to 20 metres, with an average of 14 metres. Conditions are generally manageable with mild currents, though currents can strengthen unexpectedly around the pinnacle. Visibility typically ranges between 5 and 10 metres. Due to the variable visibility, divers should remain close to their guide and use the reef structure as a reference point. The site is suitable for beginners and supports night diving. Species recorded around this area include wrasses, groupers, butterflyfish, and various reef-associated fish and invertebrates.

Khom Beach in Ang Thong Marine Park offers a straightforward shore dive suitable for beginners. The site features a reef composed of hard and soft corals at depths ranging from 2 to 11 metres, with an average of 6 metres. Divers experience mild currents and visibility between 3 and 10 metres. Due to the presence of sharp coral and rocks, care is required during entry and exit. Titan triggerfish may be encountered and can be territorial, so maintain a respectful distance. Species recorded around this area include various butterflyfish, wrasses, groupers, and anemonefish. A cafe is available on-site for post-dive refreshments.

Mae Haad is a reef site located in Ang Thong Marine Park, suitable for both diving and snorkelling. The site features depths ranging from 8 to 20 metres, with an average of 14 metres. Conditions include mild currents and visibility that varies between 5 and 30 metres. Access is available via shore or boat. Divers should be cautious of sharp coral and rocks, as well as sea urchins hidden in crevices. Jellyfish are also present, making a full rash guard or thin wetsuit advisable. On-site facilities include a dive shop, equipment rental, and air fills. Night diving is available for those interested in exploring the reef after dark.

Haad Salad is a shore-access reef dive located in Ang Thong Marine Park. The site features depths ranging from 8 to 14 metres, with an average depth of 10 metres, making it suitable for beginner divers. Conditions include mild currents and visibility that varies between 3 and 15 metres. Divers should exercise caution during shore entry due to the presence of rocks and sharp coral in the shallows. Sea urchins are present on the reef, so avoid touching the surface or kneeling. Night diving is available at this site, offering a different perspective on the reef environment. Local dive shops provide equipment and guidance for those planning a visit.