August is pretty much a torture month heat wise....yeesh!!
It was also kind of busy last August when we went, but I think the worst thing was def the heat! LOL
It's dry, but it's still hot -- it's like walking into an oven. It's okay in small doses, and it's not bad if you're hanging out at the pool, but it's hot.
(I never did the zipline on Fremont Street, but I wanted to (just ran out of time), and it looked like fun.)