Haven't been there in a while, but it's absolutely HUGE and the food is ridiculously expensive. I presume that you still get to see the aquarium or whatever you call it, for free if you stay there. That is amazing!! I hope you get free chairs on the beach if you stay there, as the price to rent chairs is ridiculous. Hopefully you're not going REAL soon, as the weather could be kind of chilly this time of year..
What part are you staying in? Be prepared to walk long distances. It is a very busy place. Children tend to get hyper and behave badly so if you don't have kids avoid the family friendly restaurants. Mesa is a good restaurant.