MaCarran Airport is truly made with the traveler in mind. It sits right next to the strip so you can quickly hit the casinos and everything they have to offer. If your flight is delayed there is entertainment in the form of slot machines...am I sensing a pattern??
If you are picking someone up at the baggage area you will find that there are three escalators bringing people from the gates to baggage. There is no way to tell which escalator they will be coming down so you will just have to watch the flow of people.
As a backup plan we always tell incoming visitors to meet us at the Starbucks in baggage claim. It is about half way down on the left when coming off the escalators.