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.

Playa Escondida Reef is a marine site located off Tortuga Island, Costa Rica. This reef environment is accessed exclusively by boat and is suited for intermediate divers. The site features depths ranging from 6 to 15 metres, with an average depth of 10 metres. Conditions vary, with visibility typically between 10 and 25 metres and moderate currents. The water temperature remains warm throughout the year, generally between 27 and 29 degrees Celsius. Divers and snorkellers should be aware of potential hazards including rip currents, sharp coral, and surf. The site is well-regarded for snorkelling, particularly at mid-tide when water levels provide sufficient clearance over the reef.

Playa Mantas North Point is a rocky outcropping on the Nicoya Peninsula that offers a gentle slope into the water, making it suitable for beginner snorkelers. The site features natural tide pools accessible at low tide. Snorkelers can expect depths ranging from 2 to 8 metres, with an average depth of 4 metres. Conditions are generally mild, though visibility varies between 5 and 15 metres. Water temperatures are consistently warm, ranging from 28C to 30C throughout the year, which presents a risk of overheating. Shore access is available, and the site includes parking, toilets, and showers. Hazards at this location include jellyfish, sea urchins, and sharp coral.

Pesebre is a shallow reef located 750 metres off the coast of Tortuga Island, Costa Rica. With depths ranging from 1 to 3 metres, this site is suitable for beginner divers. The area experiences mild currents and visibility between 10 and 30 metres. Access is by boat only. Divers should maintain good buoyancy control to avoid contact with sharp coral and rocks, as surge can be present, particularly on windier days. Water temperatures remain between 28 and 30 degrees Celsius. As facilities are unconfirmed, visitors should bring all necessary equipment from the nearest town.

Punta Conejo is a rocky reef site located off Tortuga Island, Costa Rica. Situated approximately 1609 metres from the shore, the site features a shallow profile with depths ranging from 1 to 10 metres, averaging 5 metres. Access is possible via boat or shore, though a boat is required to reach the site. Divers and snorkellers should anticipate mild currents and visibility that varies between 5 and 20 metres. Due to the potential for low visibility, this site is best suited for intermediate-level divers. The water temperature remains consistent throughout the year, typically ranging between 27 and 30 degrees Celsius.

Herradura at Tortuga Island offers a diverse underwater environment featuring natural reefs, artificial structures, caves, and caverns. Reaching depths of up to 15 metres, the site is suitable for beginner divers. Conditions include mild currents, though divers should remain aware of surge and swell, which can affect visibility and create potential hazards near sharp coral and rock formations. Boat access is required, and it is recommended to dive with local guided tours to navigate the cavern sections safely. Divers should monitor for boat traffic during ascents and stay close to their vessel. Air fills and guided services are available on-site.

Middle Reef at Tortuga Island features a combination of natural reef and artificial structures. Suitable for beginners, the site offers a depth range of 1 to 30 metres with an average of 15 metres. Conditions include mild currents and visibility ranging from 10 to 30 metres. Water temperatures remain consistent between 25 and 27 degrees Celsius. Access is by boat only, located 2000 metres from shore. The site is suitable for both diving and snorkelling, and night diving is permitted. Divers should remain cautious of boat traffic, surge, and potential rip currents. Guided tours, equipment rental, and air fills are available locally.

Playa Agujas is a dark-sand beach featuring significant rock formations that create natural pools at low tide. This reef site is suitable for beginners, offering shallow snorkeling at depths between 1 and 5 metres, with an average of 3 metres. Access is via a shore entry. Conditions vary, with visibility ranging from 5 to 15 metres and mild currents. Hazards include surf, surge, rip currents, sharp coral, and sea urchins. Facilities at the site include showers and changing rooms. Species recorded around this area include Cortez Angelfish, Scorpionfish, White-spotted Puffer, Groupers, Guineafowl Puffer, Rock Cod, Sally Lightfoot Crabs, Sea Hares, Sergeants, Sea Stars, snails, sea cucumbers, and kelpfish.