Hi, we plan to do a driving trip from LA to Blue Ridge Parkway and back in May. Is it doable in three weeks? If so, please suggest the scenic routes we should take. We've done two road trips, one covering West Coast and another, the Midwest. We have been told to fly to New York instead, take rental car from there and drive to BRP but we would like to stop by Las Vegas on the way back. Would appreciate your advice.