With nearly any hotel/chain, you can call the front desk on your day of departure to check out. I often do this when in a rush to catch a flight, and to avoid the line. They will fax your bill to you if you wish. Also if you don't do anything at all, 99.9% of the time, the hotel will just check you out automatically. Again the key is to either charge the room and/or some incidental to Master Card.