Lots of suggestions already posted, all good. All you need to do is figure out what interests you the most. But the highway through southern Canada is much easier on you and your unit than the roads in the U.S. Just avoid the toll roads near Toronto, which is easy to do. (You will need passports if you don't already have them.) Coming back into the U.S at Port Huron, Michigan will allow you to easily tour northern Michigan and the Upper Peninsula and continue west to without fighting traffic around the southern end of Lake Michigan.
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