This was also a concern of mine, as we will be arriving around 7 PM for our stay at Pop Century. I was told by a CM that they actually assign the room number to the guest's name 3 days ahead of time so as to try to accomodate all special requests. Other rooms are then given out as available to those who check in without advanced requests. So if you want a ground room, room close to pool, room far from pool, or room in a certain building, give the CM all of that info when you book it.