A bouquet of twenty roses waiting in the room is sure to add a little romance. I had actually suggested this on another thread. Use the "20" theme. Ask for a room number with 20 in it. Is there a 20th floor perhaps? What's her favorite ride? Why, don't you have some fun with it and see if she's game to go on it 20 times...the possibilities are endless. It can be serious or silly, but your wife is sure to see what a special occasion it is to you and how happy you are to be sharing it together.
Have fun and start saving up for the trip when you need to buy 50 roses!!!