Trails at Mammoth Cave National Park - Mammoth Cave National Park (U.S. National Park Service) Mammoth Cave National Park is a place for letting your feet lead you – or your horse's hooves, or the tread of your bike's tires. With nearly 84 miles of trail in the backcountry, frontcountry and Visitor Center areas combined, from easy to rugged, you're certain to find just the one-on-one with nature you're looking for.