For a true “ghost stories by the campfire" experience, you really can’t top Mammoth Cave Campground. Home of the largest cave system in the world, the Mammoth Cave Park transports its visitors to Middle Earth (hobbits not included, sadly) for ranger-led tours. When you’re feeling a bit Vitamin D-deficient, the rest of the park offers nearly 84 miles of trails—many of which are bike- and horse-friendly—and more than 30 miles of the Green and Nolin Rivers, favorites of boaters and fishers/lovers of muskellunge, bluegill, catfish, bass, perch, and crappie.