From the guidebook Hiking Indiana:
1. Adventure Hiking Trail (Corydon) – 23 miles – This is a long-distance loop trail along forested river bluffs, ravines, sinkholes and caves. The Adventure Hiking Trail keeps is the second-longest trail in the state next to the Knobstone Trail (ranked #7 & 10).
2. Low Gap Trail in Morgan-Monroe State Forest (Martinsville) – 10 miles – This loop trail covers steep, forested ridges, ravines, creeks and the Back Country Area of Morgan-Monroe State Forest. It is one of two 10-mile hikes in Morgan-Monroe State Forest.
3. Clifty Falls State Park (Madison) – 7 miles – This combination of park trails forms a loop hike through Clifty Falls Canyon. Highlights include five waterfalls, rock-strewn portion of Clifty Creek and sheer-walled canyons.
4. Turkey Run State Park (Crawfordsville) – 3 miles – This combination of park trails loops through canyons and along scenic Sugar Creek.
5. Beach Trail (Chesterton) – 7 miles – Housed in Indiana Dunes State Park, this loop trail travels along Lake Michigan, through woods and concluding with a climb through dunes.
Check out Trails.com for the rest of Indiana’s best trails.