Well...all good ideas...i am partial to NEWPORT,RI, easy airport to fly into and out of...the airport is near providence, from that airport (TF GREEN) you can: 1. rent a car and drive to newport..once the summer "home" to the countries wealthiest...see there "summer homes"..(newportconventionand vistors center)...see many beaches and enjoy shopping and great food...
2.Go to Boston, can take the train from said AIRPORT...
3.enjoy all Boston has to offer...
4.head to Portsmouth,NH and Kittery,ME,both a short driver from Boston.....
there is another alternative..FLY to NYC and get on a New England/Canada cruise ..this method they can get a taste of the NorthEast and canada with a hotel and meals already taken care of...Princess Cruise Line heads this way all fall with stops in NYC,Newport,Boston,ME and the Canadian Maritimes...
Disney is also offering a cruise this way but with limited stops....