No clue on the cheese shops (though even small towns in Wisconsin often have a cheese shop or factory) but WI SPs are superb. Most have electric sites - often 1/2 or more of the CG. You will need advance reservations for weekends in SPs, I think - many of them are very popular, and their booking window is 11 months in advance - so don't delay!
There is a cheese factory in the little central WI town of Knowlton (guess how we found that out!), near Marshfield. SPs not terribly far away that have some nice sites could include Council Grounds SP (gorgeous & heavily wooded) or Rib Mountain (not sure if they have electric sites).
For sightseeing you can't beat Door County, but it will be VERY popular. Best SPs there for a B: Peninsula or Potawatomi. One of our favorites is Point Beach State Forest - nice wooded CG, beachfront on Lake Michigan, and lots to see in the area, with some ship/boating museums in Two Rivers, and a good base camp for the southern part of Door County too.
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