There is lots to listen to out here - depends on your preference I guess. I lean pretty heavily toward civilian and military air. But SNACC has all sorts of things happening on it (especially in early morning hours some days). I also usually will work on figuring out talk groups for the strip casinos / hotels when I need something different for a while. If you want to test your skills at understanding really bad english give that a try along with the taxi / transportation services
In around Vegas I'd be searching for the unknown stuff...illegal, illicit activities using FRS, GMRS, MARINE, BUSINESS BAND, CB, 900MHz, etc Room bugs, etc.