I don't know if its the same on the Wonder, but on the Magic they have a themed dinner one night, Pirate Night. The waiters and head waiters are all dressed up as pirates and most of the guests are too. The menu is "Pirate" themed (our favorite of the 7 we had),and they do a little show during dinner, with music (yo ho yo ho, a pirates life for me), dancing, the waiters got the kids up doing the conga line. They also give out bandanas to everyone at dinner.
Then that night there is a deck party. Unfortunately, when we went it was lightning out so the deck party was held in the atrium. It was a bit crowded, but, again, there was music, dancing, characters, etc.. The only thing we were missing was the fireworks, but they held them the following night.
It was really a lot of fun. I almost wasnt going to bother dressing the kids up and lugging hats and what not along with us, but I did and Im glad I did.