Tortuga Island offers a diverse underwater environment featuring reefs, wrecks, pinnacles, and artificial structures. Divers can explore depths ranging from 1 to 30 metres, with an average depth of 18 metres. The site is accessible by boat, which is required to reach the location. Conditions are variable, with visibility ranging from 5 to 30 metres and mild currents. The site is suitable for beginners and typically involves 45-minute dives. Facilities available at the location include parking, toilets, showers, changing rooms, guided tours, boat charters, and a cafe. Hazards to be aware of include boat traffic, surge, and potential encounters with jellyfish or sea urchins.

Isla Tortuga, specifically the Los Morteros area, features volcanic rock formations that serve as a primary snorkeling location off the Nicoya Peninsula. The site is suitable for beginners, with depths ranging from 2 to 15 metres and an average depth of 8 metres. Access is strictly by boat, as the site is located 30 kilometres from the shore. Conditions vary, with visibility reaching up to 30 metres and currents typically remaining mild. Water temperatures are consistent, ranging between 28 and 30 degrees Celsius throughout the year. Divers and snorkellers should be aware of sea urchins and sharp coral present in the area.

Sharks is a reef dive site located off Tortuga Island, Costa Rica. This site is accessible only by boat and is suitable for beginner divers. The topography consists of a reef with an average depth of 6 metres. Divers can expect mild currents and visibility typically ranging between 10 and 15 metres. Water temperatures are consistent, generally remaining between 28 and 30 degrees Celsius throughout the year. The typical dive duration at this location is 45 minutes. Divers should be aware of sharp coral present in the area.

Acuario is a shallow reef site located 1500 metres off the coast of Tortuga Island. The site features a depth range of 6 to 10 metres, with an average depth of 8 metres, making it suitable for beginners. Divers typically experience mild currents and visibility ranging from 10 to 25 metres. Water temperatures remain warm between 27 and 29 degrees Celsius, though occasional cold thermoclines may occur. Access is by boat only. Divers should be aware of boat traffic in the area and exercise caution around sharp coral. Facilities including parking, toilets, showers, and a dive shop are available nearby.

Cocalito is a boat-access reef dive located off Tortuga Island. The site features a moderately deep slope with reef and canyon structures, ranging from 10 to 18 metres in depth with an average of 14 metres. Visibility typically spans 10 to 20 metres, and the water temperature remains between 26 and 28 degrees Celsius. The current is generally mild, making it suitable for beginner divers. Divers should exercise caution around sharp rock and coral formations to avoid injury. Hazards include jellyfish, stonefish, and active boat traffic. Maintain neutral buoyancy and use a surface marker buoy or the anchor line for ascents.

La Chancha is a reef site located off Tortuga Island, Costa Rica, offering diving at depths between 15 and 25 metres. Access is exclusively by boat, and divers should be prepared for moderate currents that can become more pronounced in the deeper sections of the reef. Visibility at the site typically ranges from 9 to 15 metres. Water temperatures remain consistent throughout the year, fluctuating between 25 and 28 degrees Celsius. Due to the presence of rip currents, strong currents, and surface surf, this site is recommended for intermediate divers comfortable with moving water. Always coordinate boat entry and exit procedures with your skipper to manage surface conditions.

Rio Lajas is a reef site located off the Nicoya Peninsula, accessible only by boat. The topography features a reef structure that reaches depths of 16 metres, though some areas extend to 35 metres. Divers should expect variable visibility and moderate to strong currents, including potential rip currents. The site is suited for intermediate divers who can manage buoyancy and current awareness. Hazards include surf at the entry, entanglement risks, sharp coral, and the presence of crocodiles in the nearby river zone. Stonefish may also be present on the reef. Divers should maintain a conservative approach and ensure their boat operator is experienced with local conditions.

Playa Blanca Underwater Museum at Tortuga Island is an artificial reef featuring a collection of life-sized sculptures, including a giant manta ray and the Cacique Garabito. Located 50 metres from the shore, the site is accessible for both divers and snorkellers. The average depth is 4 metres, with a range of 2 to 6 metres. Water temperatures remain warm throughout the year, typically between 28C and 30C. Entry is from the shore, and the site is suitable for beginners. Visitors should be aware of potential hazards including surf and periods of low visibility. Parking facilities are available for those visiting the area.