Originally posted by idratherbeinwdw
I hate to put a damper on things but the parks ARE insanely crowded during Christmas week. They are open extra late to try to offset this, but with your kids being 5 and 6 I don't think that will help much, since I imagine they will be cranky if you keep them up past their bedtime.
My only suggestion if you decide to go is to get up early as possible and be there when the park you want to visit opens. You can see twice as much in half the time first thing in the morning. If you wait and get there around 11 or so everything will be packed, and your experience will likely be very frustrating.
Fast pass can help a little, but since you can't get a second one until the time stamped on the first one, you can't do everything you'd like. And sometimes the fastpass time you get is hours away, especially if you get there late. Lastly they only have a certain number of fast passes to distribute per day, and then you can't get one at all.
You might just want to go to one of the parks for a few hours in the morning and spend much of the rest of the trip enjoying your resort.