Originally Posted by
peteropny
You don't even necessarily have to do this - once housekeeping checks on the room and find that you are no longer occupying it - the front desk will check you out. For Full-Service properties, you can also do Web-out (web checkout).
I would call to be safe. I had a recent stay where they showed me checking in and out on the same day for some odd reason so I had to call to get the stay posted correctly.