The Big Island Shallows in Lake Phoenix is a boat-access site situated in a wider section of the lake. The topography features a natural rocky bottom, with the leeward side of the island typically offering the best conditions. Depths range from 2 to 20 metres, with an average of 10 metres. Visibility varies between 2 and 6 metres, and currents are generally mild. The site is suitable for intermediate snorkelers. Divers and snorkelers should remain aware of boat traffic in the area. On-site facilities include parking, toilets, showers, changing rooms, a rinse station, air fills, equipment rental, a cafe, first aid, a dive shop, boat charter, guided tours, and gear storage.

Whippernock Marina Swimming Beach at Lake Phoenix offers a shallow, shore-entry site suitable for beginners. The area features a roped-off sandy beach designed to provide a protected environment for snorkeling. Depths typically range from 1 to 5 metres, with an average of 2 metres. Visibility varies between 5 and 15 metres, and currents are generally mild. As the site is located within a marina, snorkelers should remain aware of potential boat traffic in the vicinity. On-site facilities include parking, toilets, showers, changing rooms, a rinse station, equipment rental, and a cafe.

Lake Phoenix is a quarry dive site in the United States offering shore access for divers of all skill levels. The site features artificial reef structures and reaches depths between 1 and 21 metres, with an average depth of 12 metres. Visibility typically ranges from 10 to 18 metres. Divers should be prepared for a stiff thermocline year-round, as water temperatures remain cold at depth. Hazards include cold water, depth, low visibility, and sharp structures. The site is equipped with full facilities, including air fills, equipment rental, showers, changing rooms, and a dive shop. Night diving is permitted, with typical dives lasting around 40 minutes.

Lake Phoenix is a freshwater dive site featuring a variety of submerged artificial structures and wrecks. Divers can explore a collection of objects including a jump plane, a Blackhawk helicopter, buses, cars, and a boat featured in the film The Replacements. The site offers shore access with depths ranging from 6 to 20 metres. Visibility varies between 3 and 12 metres. Thermoclines are present, and water temperatures at depth rarely exceed 15.5°C in summer, dropping below 10°C in winter. The site is equipped with facilities including air fills, showers, changing rooms, and gear storage. Night diving is permitted, with typical dives lasting approximately 40 minutes.