Eagle Marsh Preserve, Exit 302, near Ft. Wayne, about 5 minutes off the highway
Free, Dusk to Dawn, No Pets, No Bikes, User Submitted
14 miles of trails. From there website, "Eagle Marsh is a 831-acre wetland nature preserve located on the southwest border of Fort Wayne, Indiana. Fourteen+ miles of trails allow hikers to access the preserve's varied habitats of shallow-water wetland, sedge meadow, prairie, mature forest and young trees."