At the last minute, we decided to go to the Boston Tea Party Ships & Museum on our first day in Boston. We hadn't made a reservation, and by the time we got over there, they were sold out for the day. That was disappointing, but they have a wait list for each tour. We were able to get on the 2nd to last one of the day and really enjoyed ourselves.
We didn't realize that this museum is not self-guided, but this made it more fun! Each person is given a card with a historical person on it and the roll they played during the Tea Party. The guides stay in character and walk you through the museum and ships. There is a bit of "Harry Potter" type magic at times, but nothing scary. Overall, the tour is probably geared a bit more towards kids, but these kids at heart had a good time too.