The Unique Area incorporated several additional acres of land near the park as well as most of the southern end of North Sandy Pond.
[4][12] Oswego County operated the beach resort for several years and built a new bathhouse, picnic pavilions, and a boardwalk.
[13] North and south of Sandy Island Beach, the shoreline has high dunes that are up to 50 feet (15 m) higher than the level of Lake Ontario.
Jack Major wrote that "For many years the most popular spot on the beach was an open-faced sandhill that overlooked North Pond.
[19] Stable coastal dunes and sandhills are structures created by dune-building plants such as beachgrass and cottonwood trees.
At that time the area around Sandy Island Beach was privately owned, but wasn't staffed, occupied, or maintained.
[10] In 1982, Dyke Riggs described the situation, "Bonfires fueled by trees on the beach and dune buggies, trucks and three-wheeled motorcycles careening around destroyed growth that holds the sand.
"[18] Since 2000, the dune overlooking Sandy Island Beach was partially rebuilt and replanted with beachgrass by New York State.