I've been checking out
THESE PHOTOS of Rattlesnake from Robert's Cove and I don't think it's quite right. It can't be Clay Point because there are no islands between there and Rattlesnake. So I'm going to go with Springfield Point which would mean that in the immediate foreground would be Melody and Keniston Islands.... a little further out would be Barndoor and Little Barndoor? Further off and to the right (and fainter) Parker Island?
....Ummmm.....you can't see Rattlesnake from Brewster Academy.
What is Longstack?
(Is there a prize for the right guesser????)