Makaha Caverns on Oahu offers a straightforward introduction to cavern diving with depths ranging from 8 to 15 metres. The site features a reef and cavern structure accessible via both shore and boat entry, located approximately 150 metres from the shore. Visibility typically spans 10 to 30 metres, allowing for clear observation of the cavern openings. While mild currents are standard, divers should monitor for surge and swell, which can increase in force within the caverns. Facilities available on-site include parking, toilets, showers, and a rinse station. The site is suitable for Open Water certified divers, with typical dives lasting around 50 minutes.

Mākua Beach on Oahu offers a shallow shore dive featuring a mix of reef and seagrass habitats. Divers can explore depths ranging from 2 to 7 metres, with visibility typically between 10 and 30 metres. The site is suitable for newly certified divers, as the underwater conditions are generally manageable with only mild currents. Entry requires caution due to the shore break and surf zone. Protective footwear is recommended to avoid injury from sharp coral and rocks on the seabed. Water temperatures remain consistent throughout the year, ranging from 24 to 27 degrees Celsius.

Turtle's Reef is a marine reef site located off the coast of Oahu, United States. Accessible only by boat, the site sits approximately 4023 metres from shore. Divers can expect depths ranging from 5 to 12 metres, with an average depth of 10 metres. Conditions are generally mild, with visibility typically between 15 and 30 metres. Water temperatures remain consistent throughout the year, averaging between 25 and 26 degrees Celsius. The site is suitable for beginners, with typical dives lasting around 30 minutes. Hazards at this location include boat traffic and the presence of sharks. Guided tours, boat charters, and equipment rental facilities are available for visitors.

Five Inch Reef is a marine reef site located off the coast of Oahu, Hawaii. The site is characterised by a consistent depth of approximately 8 metres, making it a suitable location for beginner divers. Conditions at this site are subject to variation, though water temperatures remain stable between 25C and 27C throughout the year. As a reef environment, the topography consists of submerged rock structures typical of the region. Access to this site is typically by boat, and it is suitable for those seeking shallow, accessible reef diving.

Pokai Bay on Oahu offers a shore-entry reef experience suitable for beginners. The site features depths ranging from 6 to 21 metres, with an average depth of 10 metres. Conditions vary, with visibility between 1 and 15 metres and mild currents. Divers and snorkellers should be aware of potential hazards including surf, strong currents, sharp coral, jellyfish, and sharks. Facilities at the site include parking, toilets, and showers. Species recorded around this area include the Spanish Dancer, Potter's Angelfish, Whitetip Reef Shark, Leaf Scorpionfish, Speckled Butterflyfish, Blue Dragon, Wedgetail Triggerfish, Snake Eel, Varicose Wart Slug, Scorpionfish, Desirable Flabellina, Slate Pencil Urchin, Slipper Lobster, and African Clown Wrasse.

Yokohama Bay is a shallow reef site on Oahu, Hawaii, suitable for both diving and snorkelling. The site features an average depth of 3 metres, making it accessible for beginners. Entry is via the shore. Marine life recorded at this site includes wrasses, which are occasionally encountered, alongside rarer sightings of Hawaiian Monk Seal, Spanish Dancer, Giant Frogfish, spiny lobster, blue dragon, sea slug, fourspot butterflyfish, banded coral shrimp, spotted boxfish, raccoon butterflyfish, flatworm, Hawaiian convict surgeonfish, and scorpionfish. Water temperatures at this location range between 24C and 27C throughout the year.

The LCU is a landing craft utility vessel located off the coast of Oahu. Originally used to transport troops and equipment, the wreck now serves as an artificial reef. This site is intended for advanced divers due to its depth, which ranges from 18 to 28 metres with an average of 27 metres. Access is by boat only, and divers should be prepared for variable currents. Visibility can reach up to 30 metres, and water temperatures remain between 24 and 26C throughout the year. Divers must be aware of the deep nature of the site and the presence of sharks.

Tracks Beach Park in Oahu offers a shallow shore dive featuring a mix of reef and artificial reef structures. Divers typically explore at an average depth of 4 metres, with dives lasting around 30 minutes. The site is suitable for beginners, though conditions vary with mild currents and potential surge. Visibility fluctuates significantly, ranging from 2 to 33 metres. Marine life recorded here includes wrasses, speckled butterflyfish, and forcepsfish. Divers may also encounter giant frogfish, Spanish dancer, spotted eagle ray, leaf scorpionfish, Potter's angelfish, whitetip reef shark, yellow-edged moray, day octopus, turkey moray, oriental flying gurnard, and snowflake moray. Facilities at the park include parking, toilets, and showers. Be aware of rip currents and sharp coral.