More ideas for an in-room party, use the on-demand on your TV to find some good Disney songs to sing along to. It will help make the mood festive. Oh, and don't get ONE all hands on deck platter, get two or more (and ask for extra crackers) and maybe some chicken wings. Go nuts! Have fun. Bring soda or other beverages down from the drink station on the top deck.
Also, just being out on the veranda itself can be very festive, no matter which side of the ship you are on. We found at each port, many other people were out on their veranda too, making merry. You can see some of them, and interact with them. Sometimes, there will be another ship in port that you can see as well. We had fun interacting with the people on the other ships too.
Party on!