Have a Blast! We have sailed on Celebration, but have sailed her sister ship, Mardi Gras.
the shows in the main atrium, which can be seen from decks 6, 7 and 8 are phenomenal. Enchanted, I believe the name was Broadway quality.
The Cucina Italian restaurant, Chi Bang (Chinese/Mexican) and Pig and Anchor all have dinner in included. Pig and Anchor was the only one for dinner you don't sign in on the hub app, just go there and enjoy (salmon was delicious).
As the previous post stated, definitely look at deck plans to get a feel for the layout and what is where based on you interests.