[font="]Formal[/font][font="] Night: If you want to get into that Tux thing. Go for it. HOWEVER: It is more than acceptable to wear a suit instead.
Semi-Formal Night: Just a tie with a shirt works but if you want to spruce it up, go for a jacket too. No big deal.
Casual Nights: Wear a golf shirt or a dress shirt w/o the tie.
Ironing: Forget ironing. Pack all your clothes as best you can to avoid wrinkles. Send out your dress clothes for pressing (not cleaning) on the first night. It won't cost you that much and then the hassle is out of the way.
Space in your cabin: If you are not staying in a suite, which most of us are not. Make a little more space for yourselves. Especially bathroom counter/shelf space. Bring 2 over the door shoe holders like you find at Target. Use one for shoes and misc. stuff. Use the other for bathroom stuff, sun screen, brushes, curling irons, etc. It will just keep stuff organized and out of the way.
Bring a power strip. At least a short one. You might need it ladies when you are trying to get ready and you are out of accessible outlets.
Bonine is better than Dramamine for motion sickness. They sell it at Walgreens, Wal-Mart and a couple other drug stores. Cheapest at Wal Mart.
Do not get a massage or facial when you are going to go the beach or the pool afterwards. Not a good idea. It is a sunburn waiting to happen. The
Castaway Cay cabana massage rocks but you can't really go snorkeling after you are done. So think about this one.
Spa: The prices can be cheaper if you go to the spa on a port day. People tend to get off the ship so the prices can be less and usually more appointments are open.