Vegas parking garages aren't safe at all. Surveillance is a joke. Why do I say that?
Four years ago, I had my car broken into and completely looted of its contents. Those contents included camping gear, books, clothing, tools, a battery charger...even spare change in the center console. The amount of stuff taken was such that one person could not possibly have carried it all away. Furthermore, it must have taken ten-plus minutes to rummage through everything and take what was valuable.
This happened in a parking garage inside a prominent Las Vegas Strip megatoilet (which, because of court action that is still unresolved, I will not name here). I immediately reported it to Security, assuming that they would be able to check surveillance tapes to see who did this (my car was literally twenty feet from a camera). They said they couldn't be bothered to go through every tape for the previous day, since I couldn't tell them exactly when it might have happened (I was staying at the hotel).
Then I filed a police report downtown. I told the Metro officer that it would probably be easy to catch the perpetrator(s), since whoever took all my stuff must have loaded it into a car, which could be easily identified by its license plate on the camera(s). The officer said that they "couldn't spare the manpower to investigate" the crime.
In Vegas, I've been shot at while driving (shattering several windows; luckily, I was uninjured), held up at gunpoint (the robber got away with $37, all I had on me, after I told him flatly that he wasn't getting my wallet and showed him that was all the money that was in it), and had my car broken into while on casino property twice. For all four crimes, no one, casino security or the local authorities, did jack shit to help or investigate.
In Las Vegas, there is only one crime: taking money from a casino (this includes the heinous crime of simply winning). That, they'll investigate.