Question about boondocking along the Great Lakes

Once you get to northeast lower Michigan I assume you will travel U.S. 23. There are a few lighthouses along this route that are in scenic areas and rich in history. Tawas point lighthouse has a state park within walking distance. In the u.p. of MI I would recommend the Great Lakes Shipwreck Museum at Whitefish Point and the Soo Locks at Sault Sainte Marie. There you will find a few nice campgrounds on the St Mary's River with excellent views of the passing freighters.
Have fun.