How about a stopover in Hawaii on the way there or the way back? It will break up the trip. We went Hawaii - LA (Anaheim) - Las Vegas - NYC for a part of our RTW honeymoon. We stayed at the Luxor too, DH loves to gamble so I stayed in our suite and ordered room service from the spa and watched cable.

I loved, loved, loved Hawaii and am planning a trip for our 10th wedding anniversary (sans kids, we'll take them another time!).

LA's pretty boring IMO, I'd go to San Francisco as a side trip if you didn't want to leave the west coast mainland.