Just got back from a Celebrity cruise to the eastern carribean, unless you really want to, hardly anyone really wore a long dress and tuxes like they tell you too. A nice dress, "cocktail" perhaps even a dressier sun dress for women seemed exceptable. I felt completely overdressed in a long dress and my husband couldn't wait to get out of his suit, especially when you are walking by people still sitting in their bathing suits staring at you. But if you like that kind of attention you can get all dolled up, hair done at the salon and tuxes for the men and you will fit in also. We had no choice, we went with ALL of my in laws!!!