You'll love the Michigan route. Beautiful.
We are new to touring but we completed the entire West coast of Michigan 2 weeks ago. Actually, Indiana state line to roughly Traverse City with my wife and 10 year old. Then my wife and I went back and did the rest (M119) to Mackinaw City. Get in hill climb mode from Manistee to Harbor Springs though.
Especially for M22. Here's our short blog on it that I posted on another thread.
thetaylorfamilyride.blogspot.com/
Have fun. Life is a bike