lake michigan circle tour...

This year my 21 year old Miata needs a lot of work. After she is in good running order we are thinking about taking her on the Lake Michigan Circle Tour. I did not know this but there are Circle Tours of each of the Great Lakes. I guess you can make the trip in 4 days but I think we will take a week, maybe both weekends. Just a little wandering trip. I've never been to Traverse City or Mackinac Island. The only time I was ever in Michigan was to Detroit on business, which I don't think counts.

Have any of you readers done this trip? Can you make some must-see suggestions? Of equal importance things we should avoid? I have ordered the book Great Lakes Circle Tour: Reliving History Along Lake Michigan's Circle Tour Route. (link on right) It is not here yet but will probably be a good resource. Any info would be greatly appreciated!