Summer day trips are the best way to take advantage of the weather without the cost and carbon-footprint of an exotic vacation. Trips by commuter rail are easy and earth-friendly. The Rockport line on the MBTA out of North Station has some great potential summer day trips, particularly at the Salem and Rockport stops.
Rockport is an adorable seaside town with great boutiques, seafood, and ocean views.
Salem, which is about a 20 minute train ride from Boston, is filled with museums, pedestrian walkways, and funky shops. The Peabody Essex Museum in downtown Salem is a great rainy-day activity, while exploring spooky 1600s graveyards, and walking along the seaport is always fun on sunny days.