If you are a car lover, I recommend swinging over to check out the Shelby Heritage Center. It is free, it is air conditioned and it is filled with some of the nicest cars in Vegas.
You enter through the gift shop, and there are plenty of things to browse there, around the corner there are a whole slew of cars to check out. You can walk around and see Shelby's from across the decades or you can wait for one of their free tours and they will tell you all about the collection.
You can also see out to the production floor where they are building and modifying cars for new Shelby owners. If you are in the neighborhood, it's worth a visit.