For our September 2 week holiday we are thinking of a 4 day stay in New York then onto Boston via Amtrak. After a couple of days in Boston we would like to spend the remainder (say a week) relaxing at a beach resort, possibly renting a holiday home. We are happy to hire a car once in Boston. Where would be a quiet scenic place to do this and what sort of temperatures could we expect in September? We would envisage flying back to UK from Boston.