What a fun experience! The museum really took pains to walk guests through the entire story of the Tea Party - not just the night itself, but the political atmosphere of what led up to it, and also the consequences of what came after. We joined a re-enactment of a meeting among the Sons, led by someone interpreting Sam Adams, and then followed a guide in cosplay down into the boat and got a good introduction to how a cargo ship looked and worked back in those days. After some spirited huzzahing we all got to take turns hurling tea chests overboard. Afterward came more information out on the docks, then into a small museum for a couple of movies and a re-enacted debate between Lord North and Sam Adams.
By all this I mean to point out that the visit was well-paced, moving through several difference changes of scenery and different media modes, which keeps it fresh and interesting for the kiddies. It's also highly interactive. I would definitely recommend for anyone with a reasonably mature six-year old and up, assuming they have a modicum of interest in history. And if they don't yet, well, it might start here.