Hours: The park is open daily dawn-dusk to pedestrian traffic. Vehicular access is permitted Mon.-Sat. 11-5. Visitor center and guided tours are available Mon.-Sat. 11-5, Memorial Day-Oct. 31. Closed Jan. 1, Easter, July 4, Labor Day, Thanksgiving, Christmas Eve, Christmas and day after Christmas. Phone ahead to confirm schedule. Allow 1 hour minimum.