Okay, here is the confusing part.... I had said day-room, but actually we have simply reserved a room just normally. They will let you check in right away if they have a room ready, if not, you still can get your wristbands right away. Some never even actually use the room. In which case you may be able to waive some of the little added fees.
The 'official' word on day-rooms is that they are not available. This is what they will tell you if you call. However, if rooms are available, you may get a room just by walking in to the either the Atlantis or the Comfort. 1.) You would not be assured of availability 2.) They still do this, but I hear that they have changed the price, so it cost just as much as reserving in advance anyhow.
We found a special promotional rate at the Comfort by going to Placestostay.com. Proceed as if you are booking the room... You will see several rates listed. Including promotional rates that I have not seen listed anywhere else. Then, write down that rate code, call the Comfort reservations 1-800 number, and book directly thru Comfort. simply ask for the rate that you want....
Otherwise, Comfort offers a 10% discount internet users rate for booking thru their site online.
Hope this helps!