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.

Duffins Creek Mouth at Rotary Park in Ajax offers a dynamic freshwater snorkelling environment where the creek meets the lake. This shore entry site is rated for intermediate snorkellers due to the variable conditions found at the confluence. Water temperatures fluctuate significantly throughout the year, ranging from 4C in the winter months to a peak of 21C in August. The site is best suited for those comfortable with changing currents and lake conditions. As a freshwater location, the topography is defined by the interaction between the creek outflow and the lakebed.

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.

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.

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.

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.

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.

Iroquois Beach is a freshwater site located on the Niagara Peninsula. The shoreline features rocky entry points that distinguish it from sandy beaches in the area. Snorkellers can access the water directly from the shore, though conditions vary and users should be aware of strong currents. Water temperatures fluctuate significantly throughout the year, ranging from 4C in the winter months to a peak of 21C in August. Parking is available for visitors. This site is suitable for beginners, though it is rated 2/5 for snorkelling activity. Due to the nature of the environment, visitors should exercise caution regarding water conditions.