We just recently came back from a 5 day cruise on the Celebrity Constellation- we haven't been on Celebrity since 2005! It's a higher class than Royal Caribbean or Norwegian Cruise line- as soon as you board, they have cold towels and champagne mimosas + wine- definitely how I like to travel!
We did everything from paddle-boarding to sailing on a Catamaran + snorkeling, margaritas and a beach break in Cozumel Mexico. We ate conch Fritters at the Conch Shack in Key West and enjoyed local shopping and site seeing. We bought the spa package so we enjoyed visiting the spa everyday- amazing!! I love vacations because I get caught up on so much great reading- I think I read about 6 books!
Celebrity was amazing, especially after coming off of the Carnival which was disappointing- their food was not as good, they skipped 2 of our destinations that we paid extra for & wouldn't refund our money -I found Celebrity to be much nicer all around. We definitely plan on cruising with them in the upcoming future.