Good Luck, Stay very hydrated!! With highs close to 120 every day your going to need it! As luck had it I never made it back out there. I am just going to stay back east to get it done. You'll do great. Stay away from walmart at night unless your armed, most of the casinos are junky and old, the Avi is one of the nicest though. If you have never been to the desert it is eye opening to see how the lifestyle is out there.
One more thing. I assume your flying into Vegas. Stop in Henderson for supplies there is a nice Costco there. Be sure to have some spare bottles of water in the car when you head to Laughlin. There are some long straights of roads between Vegas and Laughlin. It would suck to break down out there in the summer without water.