Alligator Reef Lighthouse is a prominent reef system centred around a black-and-white iron lighthouse structure. The site features a 19th-century shipwreck located nearby. Depths range from 2 to 27 metres, with an average depth of 7 metres, making it suitable for beginners. Access is by boat only, as the site is situated 7,400 metres from the shore. Visibility varies between 7 and 30 metres. Water temperatures fluctuate between 24C and 31C throughout the year. Hazards at this location include boat traffic, deep sections, sharks, and sharp coral. Guided tours and boat charters are available for those visiting the area.

Alligator Reef is a shallow coral reef and wreck site located 6437 metres from shore near Islamorada. The site features a mix of stony and gorgonian corals alongside the remains of an unidentified shipwreck. With depths ranging from 2 to 12 metres and an average of 7 metres, the site is suitable for beginners. Access is by boat only. Visibility varies significantly from 6 to 30 metres, and currents are generally mild. Divers should remain aware of boat traffic, surf, and sharp coral structures in the area. Water temperatures range from 24C to 30C throughout the year.

Recovery Room is a shallow reef located at Alligator Reef, Islamorada. Reaching a maximum depth of 14 metres, the site is well-suited for beginner divers. The reef structure features a mix of hard and soft corals. Divers regularly encounter parrotfish, damselfish, angelfish, and snapper among the coral heads. Green sea turtles and moray eels are also frequently observed. Conditions are generally manageable with mild currents. Water temperatures range from 24C to 30C throughout the year, typically requiring only a 3mm wetsuit or skin suit. As this is a boat-access site located 1500 metres from shore, divers must remain vigilant regarding boat traffic during ascents and surface intervals.

Cindy's Corner at Alligator Reef features a combination of natural reef and artificial structures. Divers can explore this site at depths ranging from 0 to 14 metres, with an average depth of 14 metres. Conditions are generally comfortable, characterised by mild currents and visibility between 15 and 30 metres. This site is suitable for beginners, though caution is required to avoid contact with sharp coral and rocks. Boat entry is required to access the site, and typical dives last around 60 minutes. Water temperatures fluctuate between 24C and 30C throughout the year.

Crater is a deep reef site located 1500 metres offshore at Alligator Reef. The topography features a significant drop-off, with depths ranging from 35 to 60 metres. Divers should expect visibility between 15 and 40 metres, allowing for clear observation of the reef structure. Conditions are generally characterised by mild currents, though unpredictable surge and swell can occur. Due to the depth and potential for sharp coral and rock edges, this site is strictly for advanced divers. Access is by boat only, and night diving is permitted. Divers should maintain precise buoyancy control and plan gas consumption conservatively given the depth profile.

Corona is a shallow reef site located at Alligator Reef, United States. Reached exclusively by boat, the site features depths ranging from the surface to 12 metres, with an average depth of 6 metres. Visibility typically spans 10 to 25 metres, and mild currents make it suitable for beginner divers. Divers should remain mindful of surge and swell, which can push swimmers toward sharp coral and rocks. Water temperatures are warm, fluctuating between 24 and 30 degrees Celsius throughout the year. Typical dives last approximately 50 minutes. Maintain neutral buoyancy to avoid contact with the reef structure and keep a safe distance from any sharks encountered.

The Eagle is a deliberately sunk vessel resting on a sandy bottom at depths reaching 44 metres, with the shallowest sections of the superstructure accessible at 12 metres. This advanced wreck dive requires boat access and careful planning due to moderate currents, significant depth, and overhead environments. Visibility typically ranges from 10 to 30 metres. Divers should monitor nitrogen levels to manage narcosis and remain aware of boat traffic during ascents. Species recorded around this area include nurse sharks, great barracuda, green sea turtles, and various angelfish. Bull sharks are also present in the vicinity. Always deploy an SMB before surfacing due to heavy boat traffic.

Crater Jr. is a shallow reef site located at Hen and Chickens Reef, reaching a maximum depth of 16 metres. The topography is defined by spur and groove coral formations, which create natural channels and structures to navigate. This site is suitable for beginners due to the manageable, mild currents. Access is by boat only, and divers should arrange transport and equipment with a local operator in advance. Water temperatures remain warm throughout the year, ranging from 24 to 30 degrees Celsius, making a light wetsuit or skin suit appropriate for most visits. Visibility at the site is variable, so checking local reports before departure is recommended.