am really struggling with putting this route together. We are leaving West Yellowstone for a two night stay in Vernal Utah. Should we just take 15 to 80, or can we take 191 all the way down. If we do take 191 then how can we avoid going all through Yellowstone Park? Can we take 20 down and then 26 over to 191? for the next leg, Vernal Utah to St George Utah, which is the best way? Can we take 191 to 10 to 70 over to 15, or do we need to take 40 over to 15? We are driving a 2004 Pace Arrow 36" gasser. We are traveling with kids and getting to our destinations is important. So, while i would enjoy a more scenic route, if it is going to add hours of driving time to our day then it is probably not the route for us. This is our first big multi-state trip. Thanks for your help!