You can request a window seat when you arrive at the podium to check in; they will not reserve them for you ahead of time. And because everyone requests a window seat, there's a good chance you will not get one, even for an anniversary as we all go there for the same thing. However, CG has 2 viewing platforms where you actually walk out of the restaurant and stand and that's what everyone who isn't at a window seat does.
It's a spectacular view of them. I think it's better than being at the park itself. We do it every trip.