If the young ones are getting restless, make tracks to Childrens Museum of Portsmouth. With lots of hands-on exhibits and displays, this place makes learning exciting.
You'll have no end of sightseeing choices when in Portsmouth. Children's Museum of Portsmouth is a great place to kick off here, but there are plenty of other fine spots to consider. Fort Constitution Historical Site, Market Square, and Kittery Premium Outlets are near the interactive exhibit for kids and and will cap off your day nicely.