Get Some Rest
Driving, especially for hours on end, can be much more exhausting than you expect to be. At some point, you will have to stop and sleep. Being well-rested is the key to fully enjoying the sights to be seen. Look for hotel deals or stay with friends along the way! If you have someone with you who can work from the road, plan it as you go. This will give you the flexibility to stop and go when you get tired and explore as you please.