If they are selling T-shirts (or sweatshirts - depending on the weather), I think I'll buy us some matching shirts to wear with jeans. Most people just wear the usual park attire - some have on a holiday shirt/sweatshirt.
I am surprising my daughter at the hotel with a little package each day. Every night after she goes to bed, I'll put out a little giftbag with a surprise in it for her to find the next morning. I'm bringing the party bags from home, along with the tissue paper. (I'll have that packed in MY suitcase) One of the things I have for her is something I ordered from Gifts Of A Lifetime - its a headband with mouse ears and a Christmas hat! It is really cute!!! We also have the Santa hat with mouse ears!
Have a great trip! Maybe we'll see you there!!