Lion's Point on the Niagara Peninsula features a submerged rocky shelf and large boulders along the Ajax waterfront. This structure creates a distinct habitat compared to the surrounding sandy beaches and is accessible via a shore entry. Snorkelers should be aware of variable conditions, including cold water temperatures, thermoclines, and potential hazards such as boat traffic, rip currents, and strong currents. Visibility can be low, and the site is best suited for intermediate-level snorkelers. Facilities at the site include parking, toilets, showers, changing rooms, and a rinse station. Water temperatures fluctuate significantly throughout the year, ranging from 4C in winter to 21C in August.

Veterans Point at Harwood Avenue South is a freshwater shore dive featuring a man-made breakwater and riprap. The crevices between the large stones function as artificial reefs. Divers can expect depths ranging from 3 to 10 metres, with an average of 6 metres. Conditions include mild currents and visibility between 2 and 8 metres. The site is suitable for beginners, though divers must be prepared for cold water and potential surf. Facilities at the site include parking, toilets, and showers. Species recorded around this area include snail, common carp, alewife, round goby, American crayfish, common perch, rainbow trout, brown bullhead, white sucker, small mouth bass, and pike.

Alex Robertson Park offers a quiet shoreline entry point at the eastern end of the Pickering waterfront. Located near the Hydro Marsh barrier, the site features shallow water where visibility is often variable due to marsh runoff. This freshwater location is suitable for beginners, though conditions are subject to cold water, potential entanglement, and surf. Water temperatures fluctuate significantly throughout the year, ranging from 4C in winter to 21C in August. Species recorded around this area include Round Goby, Brown Bullhead, snails, Alewife, Common Carp, Small Mouth Bass, White Sucker, Pike, Trout, Sun Perch, American Crayfish, Blue Gill, Rainbow Trout, and Common Perch. Facilities at the park include parking and toilets.

Carruthers Marsh is a freshwater site located on the eastern edge of Ajax, where the marsh meets the lake. The underwater terrain consists of a mix of silt and clay, featuring patches of aquatic vegetation. Snorkellers should be aware of the variable conditions, including low visibility, potential surf, and rip currents. Due to the cold water temperatures, which range from 4C to 21C throughout the year, the swimming season is limited to July through September. The site is accessible via a shore entry and is suitable for beginners, though caution regarding entanglement and cold water is advised. Facilities including parking, toilets, and a cafe are available nearby.

Beachfront Park in Pickering provides a shore entry into the freshwater environment of Lake Ontario. The site features a mix of sandy and rocky bottom topography that can shift following storm activity. Suitable for beginners, this location offers mild currents, though conditions vary significantly. Water temperatures are cold, fluctuating between 4C and 21C throughout the year. Snorkellers and divers should remain cautious of hazards including cold water, low visibility, surf, and rip currents. The park is well-equipped with amenities such as parking, toilets, showers, changing rooms, a rinse station, and an on-site cafe, with a dive shop located nearby for equipment and support.

Lynde Shores Conservation Area offers a shallow freshwater snorkelling experience where Lynde Creek meets Lake Ontario. The site features a reef-like environment with depths ranging from 1 to 5 metres, averaging 3 metres. Entry is via the shore, with the primary area located approximately 10 metres from the shoreline. Conditions are variable, with visibility typically between 2 and 6 metres and mild currents. Water temperatures fluctuate significantly throughout the year, ranging from 4C in winter to 21C in August. Due to the cold water and low visibility, this site is best suited for beginners who are prepared for freshwater conditions. Typical sessions last around 30 minutes.

Rotary Frenchman's Bay West Park, located on the southwest shore of Frenchman's Bay, provides a sheltered freshwater environment suitable for beginner snorkellers. The site features a sandy, shallow entry point leading to depths ranging from 1 to 5 metres, with an average depth of 3 metres. Conditions are generally mild, though water temperatures fluctuate significantly throughout the year, ranging from 4C to 21C. The area is well-supported by facilities including parking, toilets, showers, changing rooms, and a rinse station. Visitors can also access a nearby cafe, dive shop, and guided tour services. Typical snorkelling sessions last approximately 45 minutes.

Petticoat Creek offers a rugged snorkeling experience situated below scenic bluffs. The shoreline is characterised by rocky terrain, providing structure and crevices that differ from nearby sandy beaches. This site is suitable for intermediate snorkelers and requires a shore entry. Conditions vary, with visibility typically ranging between 3 and 6 metres and water temperatures fluctuating from 4C to 22C throughout the year. Be aware of potential hazards including boat traffic, surf, and cold water. Species recorded around this area include Alewife, Common Carp, Blue Gill, Sun Perch, Common Perch, Trout, Round Goby, Brown Bullhead, American Crayfish, Pike, White Sucker, and Small Mouth Bass.