Beaver Island State Park is located at the south end of Grand Island in the upper Niagara River. The 950 acre park has a half-mile sandy beach for swimming, adjacent 80 slip marina with both seasonal and transient boat slips, fishing access, car-top boat launch, multiple canoe/kayak launches, bike and nature trails, nature center, playgrounds, picnic areas, athletic fields, horseshoe pits, an 18 hole championship disc golf course, an 18-hole championship golf course.

Also located in the park is the River Lea house and musuem, home to the Grand Island Historical Society and built by William Cleveland Allen, cousin to Grover Cleveland who visited the family farm on several occasions. In winter, visitors can snowmobile by permit, cross-country ski, snowshoe, sled or ice fish. Water fowl hunting is allowed in season by permit.