There are 3 main cemeteries on Mackinaw Island and each year we visited all three since they are right next to each other. There is a Protestant cemetery, a Catholic cemetery, and a Military Cemetery. Each has its own atmosphere with burial sites dating back well over a century ago (1835 is the oldest we found). To be buried on the island you need to either have been born there or own property there.
One fascinating bit of history is the Military Post Cemetery. It is one of only 5 locations where the American flag is flown at half mast every day. The other 4 places you may have heard about, they are Arlington, Pearl Harbor, Gettysburg, and Normundy France.
A bit creepy we admit, but an annual stop on our visit to Mackinaw Island State Park.