We've camped at Wilderness a lot and like it. However, there is no shuttle into Mackinaw City. There is a private CG right in Mackinaw, Mill Creek, that is just a couple miles or so from the ferry docks to Mac Island. If you want to cross the Bridge and camp in the UP St Ignace State Park is a walkable distance from the ferry docks to the island. Ferry boats go from both Mac City and St Ignace to the Island. If you have bikes, ride to the ferry and take your bikes over. No cars on the Island, just bikes and horses. There is a bike path that circles the Island, about 8 miles to go around. Fun place.
