An official Path Through History Site! Governors Island, in the heart of New York Harbor, is a 92 acre National Historic District, open to the public for picnics, tours, concerts, car-free biking, and more. For almost two centuries, Governors Island was home to the US Army and later the Coast Guard. When the Coast Guard closed the station, 22 acres of the Island, including two 1812-era forts, were declared a National Monument, which is overseen by the National Park Service. The other 150 acres are overseen by The Trust for Governors Island.