Lake Mineral Wells State Park & Trailway is a state park located in Mineral Wells, Parker County, Texas. It includes Lake Mineral Wells, and is the only state park in Texas which protects part of the Western Cross Timbers. Also within the park is Penitentiary Hollow, a somewhat unique geological feature which resembles a small canyon. It is a popular site for rock climbing, though the only type of climbing allowed is bouldering and top-rope. The park also features over 17 miles of hiking trails, 9 of which are open to bicycles and horses. Campsites can be found by the small lake, and up on the higher areas of the park, as well.