Vegas is great in August. It might be super hot but it's also dry. Whenever I go out to DEF CON, I take a day to go out quadding around the desert and shoot some guns outdoors.

The whole damn strip is air conditioned and misted so it's not really a problem. A few years back I participated in a scavenger hunt during DEF CON and it was taxing but I would do it again.

New Orleans is hell on earth that time of year though -- never again.