Anse à la Cabane on Entry Island is a reef site characterised by rocky outcrops and red sandstone cliffs. Located near the Millerand lighthouse, the site provides sheltered conditions suitable for intermediate snorkellers. Access is via the shore, with parking facilities available nearby. Water temperatures fluctuate significantly throughout the year, ranging from -1C in late winter to 19C in August. The topography features a mix of rocky structures and benthic environments. Due to the variable nature of the local marine environment, snorkellers should be prepared for changing conditions.

Plage du Belvédère on Entry Island offers a shallow reef environment suitable for beginners. Divers and snorkellers can explore a mix of sandy and rocky patches at depths ranging from 1 to 5 metres, with an average depth of 3 metres. The site is accessed directly from the shore and features mild currents. Water temperatures vary significantly throughout the year, ranging from -1°C in winter to 19°C in August. Facilities at the site include parking, toilets, and showers. Potential hazards include the presence of jellyfish and sea urchins. Typical dives last approximately 30 minutes.

L'Étang-des-Caps, also known as Red Cliffs, is located at the western tip of Entry Island. This site features dramatic red sandstone cliffs that extend into the marine environment, creating a complex topography of reefs, caves, and caverns. Snorkellers can explore these underwater structures from a shore entry. Conditions at this location vary, and users should be aware of potential hazards including overhead environments, surf, rip currents, and strong currents. Due to these environmental factors, the site is best suited for intermediate-level snorkellers. Water temperatures fluctuate significantly throughout the year, ranging from -1C in winter months to 19C in August. Parking is available for visitors.

Plage du Port on Entry Island provides a sheltered shore entry point located just south of the main ferry pier. The site features a mix of sandy and rocky bottom topography, making it a practical location for beginners to practise snorkelling. Water temperatures are cold throughout the year, ranging from -1°C in winter to a summer peak of 19°C in August. Visitors should expect brisk conditions, with summer averages typically between 10°C and 18°C. On-site facilities include toilets and a cafe, providing convenient support for those accessing the water from the shore.

Entry Island Cliffs feature dramatic wall and reef topography located 12 kilometres from shore. This remote site is accessible by boat from Cap-aux-Meules. Snorkellers should be prepared for challenging conditions, as the area is subject to strong currents, rip currents, and surf. Water temperatures are cold, ranging from -1°C in winter to 19°C in August. Due to these environmental factors and the exposed nature of the cliffs, this site is recommended for advanced snorkellers only. Toilets are available for visitor use. The site is noted for its high cliffs and clear water conditions within the archipelago.

Lighthouse Beach on Entry Island offers a shore-entry point for snorkelling among rocky shallows and kelp forests. Located on the southern side of the island near the historic lighthouse, the site features a rocky and gravel shoreline. Conditions are variable with moderate currents and visibility typically ranging between 2 and 3 metres. Water temperatures fluctuate significantly throughout the year, reaching a maximum of 19C in August and dropping to -1C in late winter. Due to the cold water, potential for entanglement in kelp, and surf, this site is best suited for intermediate snorkellers. The habitat supports a variety of temperate marine life and invertebrates typical of the region.

Big Hill Sea Caves on Entry Island features towering red sandstone cliffs and deep sea caves accessible by boat. This reef site is suited for advanced divers due to hazards including overhead environments, surf, surge, and moderate currents. The site reaches depths of 1 to 10 metres, with an average of 5 metres. Visibility ranges from 3 to 10 metres. Water temperatures are cold, fluctuating between -1°C and 18°C throughout the year. The base of the cliffs provides a dynamic environment for snorkelling, though boat access is required to reach the site located 500 metres from shore.

La Cormorandière Islet is a rocky reef located off the northeast tip of Entry Island. The underwater topography is defined by rugged terrain, featuring large boulders and deep crevices. This site is suitable for advanced snorkellers due to the presence of strong currents and surf. Access is exclusively by boat, with typical sessions lasting around 45 minutes. Water temperatures fluctuate significantly throughout the year, ranging from -1C in late winter to 19C in August. Facilities including a cafe and toilets are available on Entry Island. As a marine environment, the site supports a variety of general marine life and invertebrates within its rocky habitat.