Clark Reservation State Park is a geologic wonder of the last ice age and a botanist's paradise. The park's natural features include rugged cliffs and rocky outcrops, woodland and meadow, a wetland and a glacial plunge basin lake in which the surface waters and bottom waters do not mix. Fishermen can catch pickerel, bullheads and sunfish; while birdwatchers may observe cedar waxwings, kingfishers and woodpeckers. The Nature Center is open seasonally from mid-May through Labor Day. Guided nature walks leave from the Nature Center building, which also offers numerous exhibits. Hikers may choose from five trails, including the cliff trail, which has a ledge overlook 175 feet above the water.