Stone Park features 7 miles of hiking trails near Sioux City, IA.
From the North side of Sioux City take Stone Park Blvd West. It will eventually become Memorial Drive. There is a fork in the road - stay left. Park in the lot just South of the East entrance. There is a trail head right there or go down the gravel 1/4 mile to another.
http://www.tripleblaze.com/trail.php?c=3&i=1325