Here is a packing list I got from a person on Cruisecritic, it is specifically for cruising guests but I'm sure a lot of things still apply so you can pick and choose what is helpful for you:
Suggested Cruise Packing List
2-3 Swimsuits & a swimsuit cover-up
(also, if you have an SPF board shirt, it will come in handy for snorkeling)
Note that Beach Towels are provided by the ship; no need to bring your own.
2-4 Shorts
5-7 T-shirts, Tank Tops
1 pair jeans (long pants & socks are required if you want to go ice skating)
Pajamas, Underwear, socks
Hat, Visor, Sunglasses
Windbreaker, or a light sweater or jacket.
Workout clothes (the gym is nice!)
Sandals or Flip-flops; Tennis shoes or good walking shoes
Water Shoes – inexpensive water shoes work fine; they are needed for Dunn’s River Falls
Dinner Clothes
Normal attire for the dining room – 4 nights of the cruise:
remember the rules: No Shorts, Tank Tops or Jeans in the dining room:
•MEN: a collared shirt (aloha shirt, any button down, or a polo shirt are all good) & slacks (Dockers are fine)
•WOMEN: skirts, sundresses, capri pants, blouses (sleeveless tops are ok for girls). You may want a light sweater, in case it is cold in the dining room.
Formal attire for the dining room – 2 nights of the cruise:
These dress-up nights are a lot of fun & a great opportunity for pictures.
•MEN: you’ll see everything from tuxes to suits to sportcoats to shirts & ties with a nice pair of dress slacks & dress shoes.
•WOMEN: again, you’ll see a variety from cocktail dresses, to long gowns, to evening pants with fancy blouses
The first night in the dining room:
We’d like everyone to wear what they wore to the wedding – that way we can get some great dinner pictures for the wedding book.
Personal Items
Prescription meds – in the original container
Toiletries
Glasses or contacts
Sunscreen
*** note that Hairdryers are provided in the rooms
Miscellaneous items that come in handy on a cruise
Camera & Charger
Disposable Water Camera
Power Strip or Extension Cord – note that there is usually only 1 power outlet per cabin
Bathroom Spray
Nightlight
Books
Alarm Clock
Insulated mugs are handy to keep your drinks cold out by the pool.
A few clothespins for drying clothes in the shower
As far as traveling by plane, here are some recommendations:
Take on the Plane
Cash
Jewelry
Book
Sunglasses
Cell Phone (and chargers) – check with your carrier about fees in the Caribbean
Prescription Meds
PASSPORTS (or Birth Certificate & Picture ID) / Plane Tickets / Confirmations
Anything you need for the wedding (just in case luggage gets lost, carry wedding clothes on).
Wait until we are at the port to put your cruise luggage tags on your bags, else they may get sent straight from the airport to the cruise terminal…. A day too early!
And, in that same vein of potential lost/delayed luggage….. I always carry on a few items of clothing for the trip, that way you can enjoy Cocoa Beach on Saturday, even if your luggage is delayed….:
•Sweatshirt
•Swimsuit
•Flaps
•Shorts & t-shirt or tank top
***** My suggestion for flyers is that each take a backpack + either a roll-on bag or a garment bag. Have any irreplaceable items (such as meds, jewelry, passports), anything you need for the wedding, and if room allows a small subset of vacation clothes) with you. There are stores in Cocoa Beach if you need to pick up toiletries & some extra clothes, in the event your suitcase just doesn’t show… and while rare, it’s been known to happen. I find that if I carry on these things, my suitcases always arrive ;-)