Descend the cliff and learn about the geologic and cultural history of the Helderbergs on this scenic and historic trail. See underground streams, look for fossils and step inside the crevice cave along the trail. Trail is moderately rugged with stairclimbing and a couple of steep slopes. Wear sturdy shoes and meet at the Indian Ladder picnic area. Walk lasts about 1.5 hours. Call 518-872-0800 to register. Park entrance fee is $6 per vehicle.