I've been there several times.  This campground has been around a long time and is well known by motorcyclists in Michigan.  It's located behind their motorcycle repair shop.  It's not a fancy campground, but it is a bargain at $10.  The northern loop has electric outlets.  The southern loop is rustic camping (groups usually camp there).  Restrooms, showers and a pavilion.  Pay the $10 at their shop.  If the shop is closed either someone will come around or you can settle up in the morning.  Firewood available on site.  Village is 1.5 miles away to get supplies.