Oats,
It's gonna be balls ### hot. 105+ easy. 110+ Very likely.
Sadly, no matter how much you work out, you and the lady will look nothing like the magazine/porn/SoCal maroons that will be at the pool, especially on a weekend.
Drugs are...uh, prevalent in Vegas. So if you're into it, e and or yay will enhance any clubbing and pool partying. Pretty much everyone else will be on something and it will help you look less like a fat pasty lawyer form NY that somehow scored a hot wife.
Have fun, sorry to be a realist.