I hope all of you have a fantastic time! And if you'll accept a few tips from somebody who would live on a cruise ship if he could:
Take half the luggage and twice the money you think you will need.
Take at least one pair of trousers with elastic in the waistband, or a comfortably large pair. You can worry about working off the excess waist you'll have when you get back.
There is a reason that the balcony cabins are so popular. Nothing compares to being able to walk out on your own balcony and smelling that sea air.
Book your return carriage (taxi, airport shuttle, whatever) from the cruise ship dock to the airport before you go. Nothing is worse than standing around for 3 hours after you return trying to catch a cab; they all seem to be busy. In fact, booking all of your to and from travel ahead of time will save you no end of sweat and bother.
A piece of duct tape the size of a dollar bill can get you out of myriad scrapes aboard a cruise ship. It truly is the miracle adhesive.
Never, NEVER draw to an inside straight at the casino :)