You can circle the other Great Lakes, but they are more built-up. Lake Superior is still pretty undeveloped on all shores and has lots of empty beaches to wander. Don't expect to go in for a swim, however, no matter how hot it may be in the summer. Lake Superior is extremely cold--to the point where they say the only reason for wearing a life jacket on a boat is so that they can retrieve your body.
On the north shore in Canada, especially, every few miles you will find a river full of rapids and low waterfalls that dumps into the lake. When we did that trip 30 years ago, we stopped at a lot of them and walked upstream across the rocks--very pretty and fresh. Not too many towns, so stock up on food before you go. Need to spend at least 3 weeks or so, with maybe a stop at Mackinac Island slightly south, where you go "back in time."
Neat towns are Duluth, Thunder Bay, Nipigon, Grand Marais, Munising, Marquette, Whitefish Bay, and Sault St Marie. Here is a brochure:
http://www.northofsuperior.org/lakesupe ... etour2012/ And a good site for information that is less commercial:
http://www.great-lakes.net/tourism/circletour/superior/