Ride Suggestion

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My lovely wife has arranged a trip to the USA for us in early March. Flying to Vegas where she has rented a Harley for a week. The bike is to be returned in LA where we fly back home. So guys, given a start point of Vegas, a week on a bike, ending in LA, what would your ideal ride be? Our last visit was with a rental car from LA to Vegas, on to the Grand Canyon, Death Valley, Yosemite, San Francisco and Hawaii. I know there are some great places to see North, but I would rather keep to the warmer areas while eventually ending up in LA. Thanks in advance.