Fort Cassin Point, located at the mouth of Otter Creek in Lake Champlain, offers a shallow freshwater snorkelling experience. The site features a mix of reef and seagrass habitats within the delta margins. Divers and snorkellers can explore depths ranging from 1 to 5 metres, with an average depth of 3 metres. The area is accessible from both shore and boat, situated approximately 50 metres from the shoreline. Conditions vary, with visibility typically between 3 and 8 metres and mild currents. The site is suitable for beginners, though participants should be prepared for cold water, potential entanglement in vegetation, and low visibility. The habitat supports various temperate freshwater fish and invertebrates.

Diamond Island Stone Wreck is a freshwater wreck site located in Lake Champlain near Crown Point. The site features the remains of a canal boat carrying a cargo of quarried stone. The vessel lies in depths ranging from 4 to 8 metres, with an average depth of 6 metres. The hull remains largely intact, allowing for clear observation of the structure and its cargo. Access to the site is by boat only. Divers and snorkellers should be aware of variable conditions, including strong currents, potential entanglement hazards, and periods of low visibility. The site is suitable for intermediate divers and is highly rated for snorkelling.

The Water Witch is a shipwreck site located in Lake Champlain, resting at a consistent depth of 27 metres. This advanced dive requires boat access and is characterised by cold water temperatures and moderate currents. Visibility is variable, ranging from 1 to 6 metres, which necessitates careful navigation and the use of torches. Due to the nature of the wreck structure, divers must be aware of entanglement risks and manage their air supply accordingly. Guided tours are available for those unfamiliar with the site layout. Divers should carry a reel and surface marker buoy to manage the conditions effectively.

Fanny's Beach is a rugged, shore-entry snorkeling site located on the south side of Basin Harbor in Lake Champlain. The lakebed consists of a mix of silt and stone. Snorkellers should expect cold water temperatures, with thermoclines present at depth. Visibility at this site typically ranges from 3 to 9 metres, and currents are generally mild. Due to the cold water and variable visibility, this site is best suited for beginners seeking a quiet experience. Facilities available at the site include parking, toilets, showers, and a cafe.

Champlain II is a shipwreck site in Lake Champlain that serves as an artificial reef. Resting at depths between 5 and 11 metres, the wreck is accessible to beginner divers, though it requires boat entry. Divers should be prepared for mild currents and variable visibility ranging from 3 to 12 metres. The site features an overhead environment within the hull, presenting risks of entanglement and sharp surfaces. Sharp thermoclines are common, and water temperatures fluctuate from the 40s°F to a summer peak of 72°F. Drysuits are strongly recommended for this freshwater dive. Guided tours are available and advised for those navigating the wreck structure.

Button Point is a peninsula on Lake Champlain featuring a rocky shore entry. The site is characterised by limestone bedrock containing 450-million-year-old fossils, which snorkelers can observe along the underwater ledges. Depths at this location start at one metre and vary as the terrain drops off. Due to the rocky entry and variable conditions, this site is best suited for intermediate snorkelers. Facilities available at the site include parking, toilets, and showers, with guided tours also offered for those interested in exploring the area.

Ship Island, also known as Fossil Flats, is a shallow freshwater site located in Lake Champlain near Button Bay. This shore-entry location features shallow flats characterised by button concretions and diverse macroinvertebrates. With depths ranging from 0 to 2 metres and an average depth of 1 metre, it is well-suited for beginners. The habitat supports various temperate freshwater fish and invertebrates typical of the region. Snorkellers should remain aware of mild currents and local boat traffic. On-site facilities include parking, toilets, showers, changing rooms, and a rinse station to support visitors.

Thompson's Point in Lake Champlain offers varied underwater topography, featuring a combination of vertical rock walls, reefs, and artificial reef structures. This shore-entry site is suited for intermediate divers, with depths ranging from 10 to 30 metres and an average depth of 20 metres. Conditions include mild currents and visibility between 3 and 10 metres. Divers should be prepared for sharp thermoclines and cold water, as drysuit diving is strongly recommended. Hazards at this location include boat traffic, entanglement risks, and low visibility. Parking is available for visitors. The site is also accessible for snorkelling, which is rated 4 out of 5.