A very pleasant hike. Multiple trail options allowed us to hike the distance that we wanted (7 miles). All routes are flat, but longer routes have stretches through the woods which are nice. Be sure to stop in the visitor's center for a map. Be sure to check out Monk's Mound. Dogs are welcome on all trails and the mound if they are leashed. We saw lots of birds and deer during our hike.
What a neat place! You can read more about it at www.cahokiamounds.org but the gist is that this is the largest archaeological site north of Mexico. Weaving throughout the site's features are several trails that can be mixed & matched to the length you desire. Guidebooks are available for a small price (