Onset is on the inexpensive side, too. We rented a 2-br house, about seven houses down from the shul, for $75/day. It was small, but more than enough for the two of us. It’s a walk to the loveliest of beaches. There’s not too much to spend add’l money on there.
Onset is geographically on the Cape, but when the Cape Cod Canal was built, it ended up being on the mainland side of the canal, by a few miles, so it isn’t all that popular as a tourist desitnation these days. But, it’s lovely, it is CERTAINLY the Cape, and has a long Jewish history dating back to the early part of the 20th century.