The only upgrade at the POFQ would be from a standard/garden view to a water view. Waterview consists of either of view of the river or a view of the pool area. We have been in a waterview room in bldg 5 on the third floor. While it is nice, we are never in the room enough for it to make a difference. We typically just request the standard or garden view. But, if you like the view of water then that would be considered an upgrade.
The only other thing I can think about would be if you were to be put in a king room. Those are more expensive. But, with three of you that doesn't sound like it would work.