If you want to be right on the shoreline of Lake Superior along the UP:
Munising Municipal CG about 3 miles west of downtown Munising right on Hwy 28. It is an older campground and grandfathered in from all the modern set back requirements. So the CG is right on the shoreline. Munising is a nice small town and gets very busy from about June 15th, especially on weekends. Not far from Pictured Rocks National Lakeshore.
I also agree with Woodland Park CG in Grand Marais, Mi. From the campground there is a row of trees then maybe 200-300 feet of sandy shoreline then the whole expanse of Lake Superior in front of you. It's pretty impressive.
Grand Marais is a small town quite a ways off the main east/west highway. If you like being off by yourself and a long way from civilization it is a great place. You can't beat the shoreline access and views. Also a popular agate hunting location.
The pictures got turned around on me. The first two are the shoreline in Grand Marais, Mi, very near the Woodland Park CG. The third picture was my camping site this past June in Munising.