My grandfather, who is in his 70's and in relatively good health, has mentioned his desire to see beautiful western scenery. So, I would like to take him, along with my wife and grandmother (also in good health) on about a 7 day roadtrip in the summer leaving from South Carolina. I'm also a history buff so I would like to see a few historical sights along the way. I've never been on a roadtrip before so I would appreciate any advice. reservations? sites? routes? etc.