My wife and I are planning a drive from Winston-Salem, NC to Seattle, WA at the end of the month (July) and have 5-7 days to finish the journey. Any suggestions on the route (I-40W -> I-5N vs. I-80W -> I-29N -> I-90W) this time of the year and any particular places to visit along the way. We are thinking of spending a bit of time that we have visiting/driving thru Mt. Rushmore and Yellowstone NP. Any suggestions/ideas/advice is appreciated. Thanks.