Mackinaw Mill Creek campground is nice, in fact I'm there right now. Lol! Mackinaw City is #2 in tourism in the state behind Frankenmuth, so it does get busy. Labor day is the most crowded because of the bridge walk. Estimate 40,000 people in town to walk the bridge, plus regular holiday travelers. Reservations otherwise not mandatory, but highly advised during the summer, especially if you need something specific, like room for a 40ft trailer ir whatever. The are 4 campgrounds on the south side of the bridge. Mill Creek (recommend), Tee Pee campground (nice, but small and always seems busy), KOA (couple miles out of town, no experiences), and mackinaw city campground (be by there a few times. One small office shack, no sewer, playground, trees, nothing. Looks like a dump in my opinion). There's a state park across the bridge which is good (kind of rustic, short walk to restaurants, on the water, etc. reservations necessary), plus 3 others in not familiar with. There's more to do on the mack city side, so I recommend mill creek and make a day trip over the bridge to St. Ignace, and then the Soo.
2011 Coachmen North Ridge 290RKD 5'er
2005 Dodge quad cab dually diesel 6'spd manual
1 weird cat with an occasional attitude problem.