This midwestern state offers beaches, caves, resorts, professional basketball, motor sports, and 24 state parks with lakes, rivers, creeks, waterfalls, and camping. Indiana Dunes National Park features more than 50 miles of trails, sand dunes, woodlands, prairies, wetlands, and wildlife. Deep caves in southern Indiana offer walking tours, gemstone mining, hiking, and camping, and at Indiana Caverns Adventure Park, visitors can take an underground boat ride.