What I've found out from some research on google...
a pop card costs 27.50ish, and allows you free pop for the entire cruise. You can choose to bring a case of pop per person.
Bringing your own alcohol is looked down upon, but you can bring 1 bottle (750ml or less) of wine or champagne per person. They charge a 10$ 'corking' fee if you drink it in the dining room, and 14$ if you drink it in the steakhouse. (Fascination doesnt have a steakhouse anyways...)
I'm reading rumors of 'punch cards' for alcohol that save you a little bit of money, and people are saying something about dining with the captain and getting 'free samples' of different alcohols.
Another thing about about alcohol is that if you bring anything other than what i mentioned earlier, they will sieze and discard it. Also, when we re-dock after our day excursions, the same thing applys. They will sieze and discard it.
As far as us smokers, there are designated spots on the ship for smoking, and I hear there is a 'duty free shop' on board where you can buy cigs with no tax, so avoid stocking up on the prior. However, you can only take 1 carton per legal age person OFFBOARD when we get back to the US, so dont stock up too much.
(I'm quitting smoking when I get back to pennsylvania, so I dont have to stock up anyways ^-^)
Another thing is this: 'formal night' is optional, and you may wish to dress up if you want, but it is not required.
ALSO, do not buy your 'excursions' on the ship, wait till you get off, because carnival has to charge tax on them, but the individual islands do not. =)
I know alot of us are first timers, and dont know what to expect about rules and whatnot, so lets all put our thoughts about this together.