Well, you're in the right place. Our family took a 5 day cruise on the Celebration in mid June. We loved the ship, and the kid had a blast. We had seen both shows (Shout and Extreme Country) previously, but we saw them again anyway.
There is a singer (Tia) I think that does her own show one night, it's really funny, and if she calls a family member up on stage, it's best just to go along. Really funny show.
Check the boards, and post any questions you have. It seems everyone here has an opinion about something, and it's all pretty light-hearted.