The Largest New York State Park is Allegany State Park which is the 3rd largest in the United States of America with 65,000 acres (97 square miles) and many miles of trails. Allegany State Park has over 35 miles of Cross Country skiing trails, 18 hiking trails and 5.6 miles of paved multi-use trails (horseback riding, snowmobiling and more) around Red House Lake area. 3 campground areas with over 375 cabins.