Duplicate post -- I also will put this on the Boston forum
Lots of times people come to this forum trying to put together a "New England Tour". It can be difficult to pin it town because all of teh regular posters have their favorite spots ... none is really "better" than the other ... just a favorite.
Today's Boston Globe magazine has a great overview of a few summer spots in each of the 6 New England states. It is in no way complete, but it's a good starting point .... and many of the sites, while described with summer in mind are also great in autumn too.
You may need to register to view the article, I'm not 100% sure, but it's worthwhile reading, especially if you are planning a visit.