We took the inlaws to the Battleship Texas. It was great. The kids had a blast, mother in law had fun, and father in law really enjoyed the whole thing. The kids always enjoy the trip. I understand it's a popular school field trip destination, as well. I can imagine children getting tired of going to see the battleship every year, but I rather enjoy it. I got to take a tour of the Mighty Mo when it was in Bremerton back in the early '80s, and I toured the Pampanito (WW2 Submarine, and the sub they used to film Down Periscope) when I was in California. There's just such an awesome feeling to tour those old ships.
When I took a trip to Massachussetts, we went to Plymouth and I got to take a tour of the Mayflower II, a full scale reproduction of the original Mayflower (which is no longer available). That was another really interesting trip.