Hudson Grotto in Crystal River is a cave and cavern site featuring a silt bottom and a maximum depth of 47 metres. The site is equipped with training platforms at depths of 8, 18, and 30 metres, alongside guide lines positioned at 9 and 18 metres. Divers encounter a hydrogen sulfide layer at approximately 32 metres. Conditions include variable visibility between 5 and 9 metres, strong currents, and distinct thermoclines. Due to the depth and environmental factors, this site is suited for intermediate divers and those conducting technical, deep, or cave training. Shore access is available, and the site supports night diving.

Howard Park Sink is a submerged sinkhole and cave system located 183 metres from the shore near the causeway. The site features a combination of cave, cavern, and surrounding seagrass beds. Depths range from 1 to 23 metres, with an average depth of 12 metres. Conditions vary, with visibility typically between 3 and 12 metres and the potential for strong currents. Due to the overhead environment, depth, and potential for entanglement, this site is suitable for advanced divers. Shore access is available, and the area is also used for snorkelling. Facilities at the location include parking, toilets, showers, changing rooms, equipment rental, and a cafe.

The Jewel is a freshwater cave system in Crystal River, Florida, offering a significant vertical range between 7 and 96 metres. This site is reserved for advanced divers with cave certification and overhead-environment experience. Entry is via shore, leading into complex passages where visibility can reach 30 metres but may drop to zero if silt is disturbed. Divers must manage mild currents and potential surges throughout the dive. Due to the overhead environment, direct ascent is not possible. Precise buoyancy control is essential to prevent siltation and mitigate risks associated with deep cave exploration and potential entanglement.

Nestle Ledge is a reef site in Tampa Bay, Florida, offering a manageable environment for beginner divers. The reef structure spans depths between 3 and 15 metres, with an average depth of 10 metres. Divers encounter mild currents, which assist with buoyancy control while navigating the site. Access is strictly by boat, and the area experiences heavy boat traffic. Divers must deploy a surface marker buoy before ascending and remain vigilant of surrounding vessel activity at all times. Water temperatures fluctuate significantly throughout the year, ranging from 17 to 30 degrees Celsius, requiring divers to check current conditions and select appropriate thermal protection before entering the water.

Honeymoon Island State Park North Beach is a shore-access site in Tampa Bay featuring seagrass habitats. Snorkellers can explore shallow waters ranging from 1 metre in depth. The site is suitable for beginners, though conditions vary with strong currents, surf, and potential rip currents. Marine life recorded at this site includes snails, which are very common, alongside uncommon horseshoe crabs and rare sightings of spotfin burrfish, drum, croaker, honeycomb cowfish, snake eels, hermit crabs, other crabs, and bream. Facilities available at the park include parking, toilets, showers, changing rooms, a rinse station, equipment rental, a cafe, and first aid. Visibility can be low, and jellyfish may be present.

Caladesi Island in Tampa Bay offers shallow reef and seagrass habitats accessible only by boat. Located approximately 4828 metres from shore, the site features an average depth of 3 metres, ranging between 1 and 5 metres. Snorkellers can expect visibility between 5 and 15 metres, though conditions vary with moderate currents and potential surf. The area is suitable for beginners, though visitors should be aware of hazards including jellyfish, rip currents, and strong currents. Species recorded around this area include horseshoe crabs, spotfin burrfish, drum, croaker, honeycomb cowfish, pufferfish, bream, hermit crabs, sea stars, crabs, white grunt, snails, and sea squirts.

Dunedin Reef is an artificial reef located 300 metres offshore in Tampa Bay. The site features shallow depths ranging from 0 to 9 metres, with an average depth of 7 metres, making it suitable for beginners. Divers experience mild currents and visibility that varies between 6 and 30 metres. Access is by boat only. Due to the presence of artificial structures, divers should exercise caution to avoid sharp objects. Boat traffic is a significant hazard at this location; it is essential to deploy a surface marker buoy before ascending and to remain vigilant throughout the dive and safety stop.

Hospital Hole is a submarine sinkhole located 300 metres from the shore in the Crystal River area. This site features a cavernous topography with depths ranging from 2 to 15 metres, averaging 10 metres. Access is exclusively by boat. Conditions vary, with visibility between 2 and 12 metres and mild currents. The water temperature fluctuates significantly throughout the year, ranging from 16C in January to 31C in July and August. The site is noted for being slightly warmer than the surrounding river, providing a thermal refuge. Hazards include boat traffic, deep water, low visibility, and overhead environments. Snorkelling is possible, though the site is primarily a cavern and cave environment.