I fly to Vegas a lot! If you are of age, Club Utopia (on the strip) and The Ra (Luxor) are th best clubs to go to.
If you are in the mood to be pampered; the spa at the Luxor is the best (for the price) that I have found.
As far as temp; they run about the same temperature as Phoenix... so far we have been in low 100's during the day, and high 90's at night.
Anyone who says "It's just a dry heat" is full of hooey! 117 is HOT with or without humidity.
Have fun.