We have stayed there twice. The first time in the center building. I can't remember the room #, but the room was ground floor & opened directly outside. It was an older, but bigger room than our second visit, where we stayed in an atrium room.
They were renovating the center building when I was there last (mothers day 2008). Personally, I am not sure I would want to stay in a room that opens to the center section indoor pool area. It seemed like it would be noisy if you wanted to go to bed early, not just because of the pool but also the games (foozeball or pool or something of that nature) that were in the pool area.
The Atrium building pool & water play are are OK. 1 larger slide, the frog slide & a few sprayers. Zero entry area means a lot of kids younger than yours will be there. But my kids were 7,7 & 4 & they really liked it.
I definately recomend the breakfast buffet. Good selection & convenient. The dinner was OK. Book the buffet in advance as it is cheaper that way (about half price). Some of the kids activities in the activity area were fun.
They will give you directions to the outlet & dutch wonderland area, they are about 15-20 minutes away.
If you choose to go, be sure to have a boston cream donut either at breakfast or in the bakery while you are there!