Follow the old towpath along the Hennepin Canal in Illinois. The towpath, 155 miles (249 km) long, was originally intended but never used for horses towing boats along the canal's main line and feeder routes.
Illinois State information page on the Hennepin Canal Parkway
Here you can join a hike if you like.
Good introduction to this National Recreation Trail
Some pictures and maps of the Hennepin Canal Trail.
Detailed day to day account.
Here a story of a biker on the trail.
About the Hennepin Canal.