Cape Cod is beautiful and you can easily take the ferry from Boston over to Provincetown at the very tip of Cape Cod. You could make Provincetown your base and then rent a car and travel about. Have you discovered Tripadvisor yet? Go to the site and type in New England and get tons of info. You can also go to the forums and post questions and get expert information and suggestions.
http://www.tripadvisor.com/ShowForum...th_Dakota.html