I was the group leader for a group of 32 going on a New Year's cruise to the Bahamas on NCL's Sky. I had been on this ship once before, but most of the rest of the group was new to the ship, and many new to cruising in general.
A few thoughts:
New Year's Eve was handled extremely well by the Sky crew. There was free champagne in the various party venues (I was at the pool deck) and bottles of much better quality champagne available for purchase, and delivered to your stateroom. The parties were hopping, and everyone seemed to be having a great time.