My wife and I are embarking on a 4 week journey commencing in Calgary, driving South to Yosemite and then roughly East finishing in New York. We'll have done california (LA, San Fran, Canyon, Vegas, Yellowstone) by then so no point heading back this way. Although we have a guide book, we've never been to the states and would love an insiders view on the "must sees" as wed hate to miss anythnig spectacular. Wed like to have a little longer however 4 weeks should be enough time to give it a good crack. All assistance welcome!