True to its name, the Adventure Hiking Trail in southern Indiana is an exciting 25-mile hiking loop that includes interesting cliff formations, sinkholes, ravines, and old pioneer homesteads.   The trail travels through the deep forests of O’Bannon Woods State Park and Harrison-Crawford State Forest, adjacent to the Ohio River.   Some of the best highlights of the trail are the many scenic views from a high bluff above the river’s northern bank.  The trail also offers four shelter houses and some great spots for secluded back country camping.