Mackinac Island, Michigan is a carfree tourist destination in the Straits of Mackinac, between Lakes Michigan and Huron. I remember when I was a child, spending a week on Mackinac Island. We rode bikes, horses, and spend a lot of time eating fudge. Of course, riding bikes is a good way to burn off that fudge.
But seriously, Mackinac Island is a prime example of how one can live without cars and still have a comfortable standard of living.