What a lovely insightful post about Mackinac Island. You may not personally like it there but I can see the pull factor, I think to visit for a day would be an awesome experience. It looks lovely actually.
Now what's all this about the British being lazy? Pfffft! I am British and I would like to beg to differ if you don't mind. Lol! Back in those times the last thing we were was lazy. While it still isn't explained in the post what the 'w' and the 'c' refers to when speaking about Mackinac Island I would imagine if it was to do with anything French the Brits would have gone out of their way to avoid the French aspect of it all given the wars we had with France.
Just one further thing, it's interesting to note that the place you visited in Michigan is called Mackinac Island as 'Mack' is very much a Scottish name, so I would imagine there is a strong Scottish link to this place.