Excuse me, I am a stranger here and I'm looking for the nearest post office.
That's no problem, turn right at the next corner, continue four blocks and there's one next to the police station.
Could you repeat that one more time?
Sure, take a right at the corner and after 4 blocks. You will see a police station. It's next door. Why not buy a guidebook to the city? You can get one at any drugstore.