Don't know about UPS, but the main Orlando Post office is at the edge of the airport on Tradeport Drive (Road?)(would need a car to ge there). It is open 24 hours a day 7 days a week (except CHristmas). Sometimes the lines can be long so be prepared. If you need to send something during normal business hours, I think there is a big FedEx location just across the street from the P.O. I am sure you can research exact locations, operating hours etc on line