I seen Hoover Dam back in 2002 when I went to Vegas for a week. Vegas was pretty and fancy but prices, ugh
I rented a car, you need a car in Vegas, don't care what tour guilds say, unless all you want to do is stay on the strip.
Visit the state parks, Red Rock Cannon, Valley of Fire if you got to Vegas, awesome
sights
Don't forget they got Chicken Ranch ***** houses a few hours form Vegas, lol, I just got a local gal in my hotel room sent up, overpriced but don't regret doing it looking back, glad I didn't go all the way with her, just a waste of $$$, in Vegas it isn't like legal all the way but like its Vegas, anything can happen
The strip clubs have knockout looking gals but us normal guys are outspend by guys dropping a few grand each time they visit. You just go a watch and hope they ask you if you want a lapdance
Never gone to Phoenix, bet it be hotter temp wise
Check out Trip Advisor, I never visit a place without going on their travel forms. They have hotel reviews also. Priceline name your own price will get you the best deal for that star level hotel but no changes or refunds, so don't change your mind or get sick
http://www.tripadvisor.com/ShowForum-g45963-i10-Las_Vegas_Nevada.html
http://www.tripadvisor.com/ShowForum-g31310-i140-Phoenix_Arizona.html