anyone in the Midwest?

We do a long Wheeling trip once a year this year we've decided to do the 7hour Airplane crash trail(starts in the UP runs into Wisconsin) we are just going to do it slowly with lots of camping. Anyone know of any other long routes in the Midwest? We are based In West Michigan but, like to explore whenever we can. Sadly as a Farmer I only get 5-10 days at a time to travel so we are stuck with Midwest trips