The Forest Preserve District of Will County's Messenger Marsh provides parking areas for cars and horse trailers, latrines, a shelter, and access to an off-leash dog park (permit required) and 5.01 miles of the limestone Spring Creek Greenway Trail, ideal for horseback riding, bicycling, hiking/running, and, in the winter, snowshoeing and cross-country skiing. Open 8 a.m.-sunset.