Caumsett State Historic Park Preserve is a state park on Lloyd Neck, a peninsula extending into the Long Island Sound, in the Village of Lloyd Harbor, New York. The historic buildings within Caumsett State Historic Park Preserve are used for a variety of activities, former polo barns are used for equestrian education and services, while other buildings host environmental education programs and the Lloyd Harbor Historical Society. Much of the remainder of the park is maintained as a nature preserve, with a focus on conservation of bird habitat. The "Caumsett Bird Conservation Area" was established in 2006 and comprises approximately 1,255 acres (5.08 km2) of the state park, two-thirds of which is forested. The remainder includes a variety of habitats, such as salt marsh and maritime beach. The designated area protects high-quality habitat that supports breeding populations of several species listed as threatened or endangered in New York State, including piping plovers, common terns, and least terns, many additional migratory species also make use of the protected landscape. The park allows for recreation such as horse-riding, fishing, jogging, hiking, biking, and cross-country skiing. Scuba diving is also allowed by permit.