That is a tough question to answer. I have carried concealed all over Las Vegas, but concealed is the operative word here. Nobody knew about it, so nothing was said. If you do carry, and do it right, then it isn't an issue. After all, if you actually need it in a place that doesn't allow it, it is a moot point.
I was talking to a friend of mine in a gun shop the other day. He had been asked to leave a casino because he bent over to pick something up off the floor and revealed the fact that he was carrying. The reason the subject came up was that the head of security at that casino just happened to be taking a CCW course in the gun shop that day. The security guy said that in theory, the didn't have a problem with him carrying, but it frightened the other patrons, so they had to do something about it. He said it was the casino's policy that civilian concealed carry was not allowed in their casino. He did say, that they did offer the service of checking your gun at the door. Of course we told him that we would not be frequenting his casino.
Just like any other place that allows concealed carry, Las Vegas has it's share of establishments that request that you don't carry on their property. Again, if they don't know about it, who cares ?