Las Vegas to the 5 National Parks in Utah to Yellowstone

Thanks all... I've been to Phoenix and Las Vegas many times in the summer months so I'm aware of the temps.... it was 94 degrees here today ( Florida) with about 100% humidity as I waxed the coach, so I'm somewhat used to high temps, the low humidity out there helps a lot. In the past, I didn't have the coach with us , nor had the time to visit the national parks in Utah. We are looking forward to seeing some of these sights before we have to head back to the east coast for a commitment in September.