What is the site cost/night at Sippewissett? Is there a limit of sleepers/tents per site or does it vary? Perhaps I should call them instead of belaboring you further...
Terry reminded me that we did Sunday through Tuesday last year due to crowd aversion and availability. It didn't seem to stop anyone from attending! I think this could put us in a better standing with some of these choices, as well as for non-camping choices.
I'll get back on the trail of these options and report later on this week.