This is my favorite post office in LV, I always stop in to drop a post card in the mail on my way to the airport every time I come visit. It's so close to the strip and has really friendly staff so it's great for those over sized items you should mail home instead of risk in your suit case.
I'll be back PO on Sunset.
Oh and if you have some time to kill, get across the street, park in the flight line viewing lot and tune in and listen to the tower communicate with landing and departing air craft.