The Forest Preserve District of Will County's Theodore Marsh provides a parking area, shelter, latrine, water fountain, playground, and access to the 9.93-mile, paved Rock Run Greenway Trail and the 4.36-mile, paved Joliet Junction Trail, both ideal for bicycling, hiking/running, in-line skating, and, in the winter, snowshoeing and cross-country skiing. Open 8 a.m.-sunset.