Mayreau Gardens, discovered by Glenroy Adams, is a collection of seven dive sites, all drift dives on the eastern side of the island. The dives can be wild drift dives over seascapes of hard corals and sea fans, or over over areas of colorful sponges and corals. The divemaster on these dives carries a drift float and all divers in the group stay together so that the dive boat can follow the group.

On the dives at Mayreau Deep, divers may see nurse sharks, or schools of large fish, such as jacks or chub. Reef fish, grouper, and others can be found among the hard corals.

The prettiest dives are in the shallow areas of Mayreau Gardens. A white sand bottom is covered with clumps of coral, bright sponges in shades of orange, red, green, pink, blue... a whole rainbow of colors.

Angelfish, the Queen Angel and French Angel grow to a large size in this area. The curious French Angels sometimes come up face to face with a diver.

Large lobster, or holes containing several lobster are commonly seen.

The wreck of the 1918 gunboat, Purina, lies in shallow water on the west side of Mayreau. This wreck, popular with divers, has almost crumbled away except for the bow and stern. The propellers are still visible being only slightly encrusted with sponge and corals. A large population of fish surrounds both the wreck and the sandy area around it.

Schools of grunts stay close to the wreck. In the shadows and holes, schools of large beautiful red squirrelfish watch divers from their protected area.

In the sandy area around the wreck, one may find a school of jacks, the gorgeous queen triggerfish or any number of other species of Caribbean fish. Anemones with shrimp, hermit crabs and other small creatures are also around the wreck.