Lydstep Haven is a coastal site in the United Kingdom featuring limestone cliffs, shallow rocky reefs, and numerous caves. Snorkellers can explore the rocky reefs at the northern end of the bay, particularly during low tide. The site reaches depths of 1 to 10 metres, with an average depth of 5 metres. Access is via the shore. Conditions vary, with potential hazards including cold water, low visibility, surf, strong currents, and overhead environments within the caves. Water temperatures fluctuate between 9C and 17C throughout the year, necessitating the use of a wetsuit for comfort and safety.

Church Doors is a coastal site in Milford Haven and Dale defined by its limestone arch and dramatic underwater topography. The site features vertical rock faces, small caves, and caverns that provide a complex environment for exploration. Snorkellers can expect to encounter a variety of temperate marine life typical of the region, including various reef fish and invertebrates inhabiting the sponges and anemones on the rock walls. Access is via the shore, and the site is suited for intermediate snorkellers due to moderate currents, potential surf, and the presence of overhead environments. Water temperatures range from 9C to 17C throughout the year, requiring appropriate thermal protection.

Stackpole Quay is a sheltered inlet in Milford Haven and Dale, offering a diverse marine environment for snorkelers. The site features a mix of reef, wall, and kelp forest topography, with depths ranging from 1 to 12 metres and an average of 7 metres. Snorkelers can observe catsharks, which are very common, alongside spiny spider crabs, cod, and various snail species. Barrel jellyfish and common moon jellyfish are occasionally encountered. With mild currents and visibility typically between 5 and 10 metres, this shore-entry site is well-suited for beginners. Water temperatures fluctuate seasonally, ranging from 9C in late winter to 17C during the summer months.

Worm's Head at Kitchens Corner is a dramatic reef and cave site located on the Inner Head. This shore-entry location offers a wild environment defined by its unique rock formations. Divers and snorkellers should be aware that conditions are variable, with strong currents and rip currents present. The site features an overhead environment within the caves, requiring careful tidal planning for safe access. Water temperatures range from 9C in winter to 18C in August. Due to the challenging conditions and currents, this site is best suited for intermediate divers and snorkellers. Parking is available nearby for those visiting the area.

Lindsway Bay is a shore-entry reef site located near Milford Haven and Dale. The site is shallow, with an average depth of approximately 5 metres. Divers should be aware of potential hazards including surf, rip currents, and strong currents. Facilities available at the location include parking and toilets. Typical dives at this site last around 30 minutes. Species recorded around this area include grey seals, curled octopus, wrasses, catsharks, flatworms, orange-clubbed nudibranchs, common lobsters, compass jellyfish, thecacera, squat lobsters, conger eels, spiny spider crabs, sea stars, and cod. Water temperatures fluctuate between 9C and 17C throughout the year.

The Dakotian is a wreck dive located off Milford Haven and Dale, sitting at depths between 7 and 20 metres with an average of 18 metres. This site is accessible to beginner divers, though it requires boat transport as it lies 1609 metres from the shore. Conditions vary, with visibility ranging from 2 to 10 metres and moderate currents present. Divers should plan their visit around slack water to manage currents and optimise visibility. Hazards include entanglement risks, low visibility, and strong currents. Jellyfish are present in the water, so full protective exposure suits are recommended to prevent stings. Shore facilities including air fills, showers, and changing rooms are available nearby.

Watwick Bay is a sheltered, south-facing site in Milford Haven and Dale, offering a shallow environment suitable for beginners. The topography consists of reefs and caves, with the eastern end featuring rock pools and shallow caves best explored at high tide. Depths range from 1 to 5 metres, with an average of 3 metres. Entry is via the shore, and currents are typically mild. Water temperatures fluctuate between 9C and 17C throughout the year, with the bay remaining slightly warmer than exposed beaches. Species recorded around this area include gray seals, curled octopus, wrasses, nudibranchs, flatworms, catsharks, conger eels, lobsters, crabs, and sea stars. Hazards include jellyfish and sea urchins.

Stack Rocks is a reef dive site located 500 metres from the shore within the Skomer Marine Reserve. The site offers depths ranging from 5 to 25 metres and is suitable for beginners, though conditions vary. Access is by boat only. Divers should be aware of potential hazards including boat traffic, sea urchins, strong currents, and surf. Water temperatures fluctuate throughout the year, ranging from 9C in the winter months to 17C in September. As a marine reef environment, the site provides a varied underwater topography for exploration.