Skip Chicago.  Go through the UP.  Nice drive. Beautiful Country.  Stop at Java Joes in St. Ignace for breakfast.  Besides you should see what we Michignaders traded Toledo for... :dankk2

If you choose to take a ferry, I live in Muskegon (home of Lake Express, I'll meet you for breakfast or lunch if you have a bit of time to wait for the boat).  Still I would take the Badger out of Ludington.  A little slower, but not much and it is really tied to some cool history with the area.  Aren't many of those coal fired work horses out there anymore...this one might not be around much longer.

I love taking the ferry.  Once you're on the boat, there is no turning back and it almost forces you to slow down and relax.  It certainly will add a totally different dimension to your experience and while a bit pricey...everyone should do it at least once!

Which ever way you go, be safe and have fun!