A tip was passed on to us by the prior owners of the villa we recently bought in Duval: The Post Office on Teague Trail is usually reeeeeal busy. So if you plan to conduct any business that involves lining up to see one of the clerks, plan on it taking a while. We went there to mail a letter a couple of Saturdays ago - - - and they were right! The line was clear through the lobby and out to the door!! I'd have rather stuck a dull pencil in my eye than wait in a line that long at a post office.
They suggested going to the location in Wildwood - said they've never encountered a line there.
Bill