FDR Park features 12 miles of hiking trails near Dubuque, IA.
Take Cedar Cross Road (at Olive Garden) South from Highway 20. Turn right on North Cascade Road. FDR Park is a few miles out of town, and the turn-off is an unmarked gravel road at Story Book Hill Childrens Petting Zoo. Follow gravel around zoo until you get to a gate. Park at the gate (don't drive through if it's open). Can be hard to find.
http://www.tripleblaze.com/trail.php?c=3&i=970