Road Trip - What to see?

I'm going on a road trip to Cali, Vegas,Colorado, Wyoming, Arizona and I don't know where else. Anyone have any places they recommend we see or visit in these states?
What are some hot spots in Vegas?

Thanks girls

Grand Canyon of course! Its amazing.

Lake Havasu so much fun!!! Def. check it out.

Vegas hot spots - Hard Rock Cafe & the Palms have great bars etc.