Wabash Trace Nature Trail- Iowa
The Wabash Trace Nature Trail is a converted railroad right-of-way running over 60 miles through the scenic Southwest Iowa countryside from Council Bluffs to Blanchard on the Iowa/Missouri border. There are numerous small towns with amenities and friendly natives. Crushed limestone but doable on a road bike if need be.
Everyone should do the famous Thursday night Taco Ride at least once.
http://www.wabashtrace.org/
http://tacoride.com/