Just trying to visualize your route, north on the west side of Lake Michigan, then up towards Duluth, on into Canada, across the north shore of Lake Superior, back into the U.S. at Sault Ste. Marie, down to Detroit, crossing back into Canada at Windsor, onto Toronto and Buffalo?
Sounds like a great trip!
Some info on crossing the Straits of Mackinac.
https://www.michigan.gov/mdot/0,4616...107--F,00.html