Stop every couple of hours and get out and walk around at the least. Mountains are mountains. You go up. You go down. You go left, right, right, left, left, right, left, etc. An interstate is a cake walk thru the mountains for the most part unless you're in an 18 wheeler. Pay attention to the road signs, if they suggest a slower speed, slow down. Never mind the morons that think they have to get there first. They're the first ones to the accidents. Take the time to stop, go in and sit down to eat at least twice a day. You really do need the break! And personally, I like ketchy tourist trap places. They're fun. So try and stop at at least one in every state for some funky little souvenir. Lots of those places have souvenir thimbles!