Thanks all! We settled on Normandy Farms for a couple of reasons, one of them being Minuteman not having any sites available for part of the time we'll be there. Thanks for the mass transit suggestions....we learned that one the hard way a couple of years ago!
We're going to hit Lexington and Concord as well....thanks for that! We've been to Salem and Plymouth (including Plimouth Plantation). We were also to Cape Cod on our last trip. I'd do that again in a heartbeat, especially after Labor Day.
Anyway, we're looking forward to the trip and appreciate everyone's kind suggestions.