THe day before you are due to check out, you will find a notice in your room or under your door. This will give you all pertinent info. Your DME pickup time will be listed, the phone number to call in order to pay checked bag fees, RAC hours.
Be sure to write down the confirmation number you are given when paying for your checked bags. I usually write the number down right on that same notice, since I bring that notice with me to both RAC and DME. The RAC CMs will want to see the conf number so they can confirm that the fees have been paid.