Activities for all ages
Museum of Science
Located in Cambridge/ Boston. There is a Planetarium ad IMAX films. Also there is a Toddle’s spot. http://www.mos.org
Children’s Museum
Amazing place for toodlers or younger babies. During the cold winter is a good place to go. There is a “Au Bon Pain” restaurant. http://www.bostonchildrensmuseum.org
Harvard Museum of Natural History
In Cambridge. http://www.hmnh.harvard.edu
MIT Museum
In Cambridge. http://web.mit.edu/museum/
New England Aquarium
In Boston. A very nice place to spend with your kids. http://www.neaq.org/index.php
Public Libraries
You will find a public librarie in most of the cities. The one I know is in Cambridge near Haravrd and there are a lot of activities for kids. Visit http://cambridgema.gov/cpl.aspx
Visiting Santa (ICS North Pole Express)
Early december in Newburryport Commuter Rail Station (1 hour from Boston driving). Check the website regularly so tickets get sold out very fast. You should know it is better for children under 6 years. It is organised by a school.