An article about a new piece of the the Underground Railroad Bicycling route being added through Detroit led me to the American Cycling Association website.
If you are looking for a wonderful resource and ideas of bike trips to take this, in my opinion, is a good website to visit. In fact in their own words, "Our mission is to inspire people of all ages to travel by bicycle. We help cyclists explore the landscapes and history of America for fitness, fun, and self-discovery". I can not find a better way of describing an adventure then that.
Check out their website and get out.