Take the back road from Munising to Grand Marais - beautiful! Duluth has an excellent malt shop on the water. Split Rock lighthouse North of Duluth - spectacular! The glass bottom boat tour in Munising is nice and take the pictured rocks boat tour.
I suggest you see Tahquamenon Falls, second largest east of the Mississippi. We liked the campground just downstream. The lower falls were better than the upper, and I think easier to get to.
Also Pancake Bay park right outside Soo.On the Canadian side: Terry Fox Memorial, Sleeping Giant, Wawa Goose.