Hike, bike, cross country ski and enjoy nature along this 31-mile crushed stone trail that follows its namesake river. Snowmobiling is allowed on designated sections only. The trail passes through 10 forest preserves, and bridges and underpasses make it possible to travel much of the trail without crossing major roads. The trail is open year-round, from 6:30 a.m. to sunset. For a free trail map, call or go to the Web site.