Lots to see and do in the U.P. of Michigan (Soo Locks, Mackinac Island, Pictured Rocks Natl. Lakeshore, Porcupine Mtns. State Park), N. Wisconsin (Apostle Islands, Bayfield), Minnesota North Shore (where to start? Duluth Harbor, 8 state parks up the shore, Superior National Forest, Grand Portage National Monument, lots of waterfalls). Thunder Bay, Ont. (Fort William park, Kakabeka Falls).
Once you get past that, there are lots of woods and roads and the tourist-type stuff is pretty scarce until you get back to the Soo Locks.