We went here just after peak foliage season, but it was still pretty crowded around noon. The popovers, soups, and warm wood fireplaces really hit the spot though, and we wound up going back again before we left.
If you don't mind eating an early lunch, that might be the best time to go. We often went later (12.45 to 1ish) and it was only just starting to thin out.
I can imagine it's quite pleasant in the summer if you are able to sit outside as well.
As for parking, just go to the north lot if there is nothing next to the restaurant! I can't understand why people circle that lot endlessly in order to avoid walking a little bit through a beautiful national park...
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