。
Could you tell me the way to the post office?
Literal
Post-office [to-へ] going way [object-を] teach-[inward-benefactive-くれませんか]?
~てくれませんか ('won't you [kindly] X?') is a politer question-framed request than the more direct ~てください. Both are polite, but the negative-question framing of ~てくれませんか leaves more space for the listener to decline, making it the softer, more deferent option.