Having ridden Mackinac Island, it's not as idyllic as you seem to picture/imagine!
Fire engine/police cars allowed; horses leave 'loads of exhaust' on the road that you'need to avoid. Plus wintertime you'll need skis to get around.
Summertime tourists abound on 'rent-a-bikes' and they are all over the road, as is devoid of passenger cars/trucks . . . so they stop and chat in middle of the road in groups, necessitating having to holler 'coming through!' . . . most haven't a clue of what that's all about
fresh horse manure? We have . . .