What to Pack

• [1] Enough [2] light-colored, [3] non-wrinkle clothes. [1] Laundry on the ship is expensive. (Century didn't have self-serve laundry, and even if they did I have no idea when I would have taken the time...) [2] It gets HOT near the equator. [3] They don't want you using irons in your cabin.
• LOTS of T-shirts. I packed 10 and bought 1, and that wasn't quite enough.
• Quick-dry bathing suits. Outside hot and sunny. Inside air-conditioned. Nuff said.
• A variety of shoes. I brought 4 pairs: dress shoes, dockers, sneakers, and "aqua socks" (in hindsight I think I would have preferred sandals instead as my 4th pair). Arik said he felt like Imelda Marcos.
• Varying degrees of sunblock. YOU WILL BURN if you don't use any. Most of us burned (in varying degrees) the first day anyway. I recommend high-strength stuff (SPF 30+) initially, then adjust down (or up!) as the week progresses. Don't forget lip sunblock too. If you burn easily, use aloe and other moisturizers frequently. I would also suggest a comfortable hat -- I think the top of my head burned slightly.
• Motion sickness stuff. The motion of a cruise ship is very different from that of a yacht or sailboat. Even in calm seas there's a slow, subtle motion that you'll most likely notice. Even if smaller boats don't bother you, it's a good idea to be prepared. Apparently, dramamine works wonders, and so do those accupressure wrist bands.
• Eyewear. If you have good vision, at least bring a pair of sunglasses. If you wear glasses, bring a spare pair, plus either prescription sunglasses or clip-ons for your normal glasses. (Broken glasses are very tough to repair/replace on the islands.) If you wear contact lenses, bring sunglasses and regular glasses. (Your eyes will dry out more quickly than you might expect.)
• Cash or Travelers Checks. Most of your expenses can be placed on credit cards, but it's good to have cash for tips, taxis/tours/food on shore, souvenirs, and the casino.
• Proof of citizenship and Photo ID. Not only do you go through US Customs in Florida, but you also need photo ID and your room key to re-board the ship after a shore excursion. A passport will cover all the bases, otherwise you'll need a birth certificate and driver's license.
• Small backpack or tote bag. Very useful for shore excursions! You might want to have dry clothes, towels, bottled water, cameras, etc. with you on shore. This can also serve as your "overnight bag," which you need for your last morning on the ship, and your carry-on bag for flights.
• Extra space in your luggage. Souvenirs can be big.
• Underwater cameras and extra film. Those single-use underwater cameras are cool for some excursions and expensive on the islands. And in general, I recommend high speed film (400+), particularly since you'll probably have a mix of indoor and outdoor shots on most rolls. Also, if you don't have a scanner or digital camera, I highly recommend "Pictures On Disk" services.
• Dressy stuff for evenings. Here's what Celebrity recommends (with my translations in italics):

  	Guys	Gals
  Formal (2 nights) "Black Tie Optional"	Tux or dress suit.	Evening gown.
  Informal (1 night) Semi-formal	Jacket, shirt, tie.	Suit or dress.
  Casual (4 nights) Business casual	Sport shirt, slacks.	Pants suit, skirt and blouse, or casual dress.
  Minimum you can get away with for the trip	One dark suit, several shirts and ties, plus 3-4 "casual" outfits.	I have no clue.

  Overall, you should avoid jeans, shorts, and sneakers at dinner time.

What NOT to Pack

• Towels. Celebrity actually recommended packing beach towels, but they allowed you to sign out their towels as you left the ship. Just be sure to return them when you re-board.
• Sporting equipment... unless you're a major enthusiast. Even then, only pack it if you know you'll use it a lot. One example is snorkeling gear, which is provided on every tour that involves snorkeling. Rentals for snorkeling on your own won't be cheap, but they won't be prohibitive either.

What Else You'll Pay For

• Tips on-board. Celebrity's recommended amounts totalled about $72 per person, spread among the waiter, busboy, Maitre d', cabin steward, and chief housekeeper. We got exceptional service in the restaurant, so we gave extra to the waiter and busboy.
• Drinks. Yes, you have to pay for soda! Celebrity offered fruit punch, lemonade, iced tea, hot tea, and coffee for free. They also gave us a variety of juices free at breakfast. Also keep in mind that when you order a drink at a bar, they automatically add a 15% tip.
• Shore excursions. Keep in mind that the ship overcharges for many of the tours they offer. Once you're off the boat, you can often purchase the same tour for 30%-50% less. Most tour guides also expect tips. (Do you see a trend here?)
• Souvenirs. Jewelry and alcohol are relatively cheap on the islands. Many places will haggle, and a lot of the salespeople are aggressive. But it's actually a very good time to buy stuff, particularly if you've been meaning to treat yourself or get someone an expensive gift.
• Other shore expenses. Food, drinks, transportation, etc., is all extra, unless it's part of an excursion or tour.
• Photos. I think the ship photographer is overpriced, but they do a very good job, and you might be tempted.
• Gambling. Many people are tempted to dump a few quarters into the slot machines. A few are tempted to spend a bit more. The casino is very similar to Atlantic City or Vegas, but I think the dealers are a little more friendly and laid back. Celebrity allowed you to borrow up to $500 per day "commission-free" using your room key, but none of us dared. :-)

My entire vacation was about $1700:
* $950 for my half of the cabin (including taxes and port charges)
* $200 airfare from DC
* $150 casino and drinks
* $150 shore excursions
* $100 tips (on and off the ship)
* $100 souvenirs, gifts
* $50 miscellaneous
Your mileage may vary.