I enjoyed roaming GPO, now The Fullerton Hotel, like you had mentioned the aircon, the stamps, or just buying some or sending it out on covers. Fortunately your arm did not get stuck in the post box, they made of thick metal.
What I remember of Fullerton was that there were these sound proof telephone booths where you could make long distance calls. Fullerton was also where you had to go if you received overseas packages. They could then determine if you had to pay taxes
