Woohoo - you will have a blast!! We did our first cruise with P&O earlier this year - 9 nights to the South Pacific and we absolutely loved it! We spent about $2000 all up on board, just DH and I, and that included a fair whack of alcohol and some terrific spa treatments for lucky me!! We also had several meals in the paid restuarants and that includes our shore tour costs.

As it's all cashless, and your cruise card is used for every transaction on board, it can be really easy to get carried away spending. We found that every day or two we asked for an account print out and that helped us keep check of how our budget was going.

What ship are you going on? Hopefully you'll go far enough out to hit international waters and then they can open the duty free