We take a cooler with wheels and a couple of 12 packs of Soda in it, we pack the beer in the luggage, and just have the room steward fill it with ice daily. It sure saves a lot of money.
We pack a small fan in case the a/c on the ship isn't working well. We also pack a power strip because there are never enough power outlets in a room. Also, don't forget the alarm clock.