An elevator takes you down 156 feet to reach these caverns. The 80-minute guided tours lead you along paved walkways and include a ¼-mi boat ride on an underground lake. The temperature down under hovers just above 50°F all year, so dress appropriately. On Friday and Saturday evenings visitors (13 and older) can opt for a lantern-lighted tour; call ahead for a reservation. The grounds include a restaurant and a motel.