Besides marveling at the bison and bats, you can hike, ride horses or bikes, camp, geocache, or take a scenic drive. Lake Theo offers no-wake boating, fishing and swimming. Bring your group for a picnic. Hiking and mountain-biking Most of our nearly 90 miles of trails are open for hiking and biking. Trails range from easy (Mesa Trail) to very challenging (Haynes Ridge Overlook Trail). Lengths range from just over 1 mile to 15 miles. Only experienced bikers should ride the more difficult trails. Access the Trailway from the park or trailheads. Take a virtual tour with our Interactive Park Trails and Trailway Map. Learn more on our Trails Information page. Horseback riding We allow horses on many of our trails. Only riders with experience should tackle the more challenging trails. These trails have cliffs and drop-offs, and steep climbs and descents. Water is usually available for animals along park trails, but you must bring your own drinking water. No water is available on the Trailway. Present proof of negative Coggins for each horse at park headquarters.