It's become the Midwest's Nantucket/Cape-Cod/Martha's Vineyard, of sorts!
Ah, but you'll be on the wrong side of the Lake!
I suppose there's always the possibility of an overnighter in Traverse or Petosky, though.
As to Door County, it's been a long time for me. Unfortunately I've been reading and anecdotally hearing it's really getting quite tourist laden. Not just the ubiquitous Chicagoans, but from across the country and even international.
One day my wife told me her NYC friends were so excited that they found the perfect place to summer, and even bought a house there! "Where", she asked? "Door County", of course!
I'm sure the internet isn't helping in this matter.
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I'm so taken by the popularity and participation in domestic driving vacations in this thread, I might consider starting a thread dedicated to domestic travel. If I do, I'll be sure to let you and the other participants know. I think there might be enough of us to support such a thread.