I've come many a time to this airport for my Vegas trips. You know you're in Las Vegas when you step off the plane and hear the slot machines dinging!
McCarran International is pretty easy to navigate, go through security, and on to your gate for your flight. I also like how there is free WiFi to use while you're waiting for your flight.
SO, whether you're arriving or departing, you can eat, shop, and even do some gambling before you take off into the sky!