Mammoth Cave National Park is located in south central Kentucky and offers families a place to experience the outdoors via cave tours and water sports. The park is the world’s longest known cave system, covering more than 400 miles. It is open year-round and admission is free, though activities cost extra. Activities include cave tours, camping, hiking, biking, canoeing, kayaking and more. Accommodations are available both in and around the park for families who want to stay the night. Dining options are also available in the park, such as the Crystal Lake Coffee Shop and the Travertine Restaurant. Picnic sites are also a great option for families.