My advice is stay away from the coke cards. Just pay for it as you go and you will come out the same total. Plus the coke cards are only for fountain soda so everrytime you want a bottle or can you end up paying for that separately.
I'm also curious if there is somewhere in Galvaston near the pier to buy wine and champagne to bring on board. The Princess website says that this is allowed and I would imagine the prices would be cheaper than here in Canada. Plus, this would mean I wouldn't have to bring it on the plane with me and lug it around everywhere.
Navigator of the Seas Jan 06
Grand Princess Jan 05
Constellation Jan 04
The coke cards are deffinately worth the money if you don't mind fountain drinks. They are $22.50 for a 7 day cruise. You also get a drink glass with the price. The only place you can not use the card is on Princess Cays and for room service.
Sea Princess 03/01
Golden Princess 10/01
Sun Princess 03/02
Sea Princess 03/03 (final BtoB)
Diamond Princess 03/04 (inaugural cruise)
Island Princess 03/05