Originally Posted by Hank Kingsley

I did about 30 years on the int'l side.

Don't be late for briefing, if you are, don't ask for a landing.
If the weather sucks, offer the landing to the other FO, he'll do the walkaround in the weather.
Don't be late coming back from your break, bad form.
Don't be late for the pickup in the morning, That's a FA move.
Know when to use "heavy" in your callsign,
Know the litany checking in with Oceanic.
Know the controllers will clear you 5 fixes downstream or the FIR boundary in Europe.
Know you'll be waiting for your room because the FA's make every room request known to man.
Know the hotels screw with the aircon at night, so hack your thermostat or call the front desk and complain, won't do any good.
Know the FA's expect you to buy them drinks if you meet at the hotel bar.
Public transportation is usually within a short walk from the hotel, if not, hire a driver and see everything. Takes research.
Sometimes you have to say you're from Canada, saves the hassle.
Use the room safe, don't take valuables.
Enjoy the hell out of it. Go to every mountain top, cathedral, dive bar, etc. Sleep when you die.