There were several articles in Airstream Life Magazine that covered "Streaming around the big lake, one was about Marina/Big Water Camping and the other about Light Houses, predominately in the Lake's Keeweenaw Peninsula. Both articles discuss camping areas and opportunities on both sides of the Lake.
Here is a photo site of our Lake Superior experience:
CIRCUMNAVIGATION OF LAKE SUPE...
Click on "Circumnavigation I and 2
RV sites in Canada parks tend to be smaller and in more natural and wooded settings, sometimes difficult to enter if you have a larger rig. But, they have beautiful settings, especially Neyes and Rossport. Other excellent sites are at Red Cliff and Nippigon Marinas.
The US side has many sites. Our top choices are Grand Maria, MI City Park, Furnace Bay NF in Mich west of Muinising, Ontonagon City Park in Mich, either SP in Mich's Keeweenaw, Ashland City Park in WI, Washburn City Park in WI and Lakehead Marina in Duluth.