On the Gifts and Gear section of the RC website, you may order decorations for your stateroom and other things, like cake, wine, etc.
My brother and I ordered a bottle of wine to be delivered to our parents' room last time, and upon ordering, they gave the option of having it set up in the room prior to arrival, or choosing a certain night and time to present it in the dining room. This was also an option for the cakes.
Majesty OTS, 4/07
Mariner OTS, 4/08
Adventure OTS, 4/09