I literally just drove to Denver and back last week from Tulsa, I was not in for site seeing so I just went to Salina and turned left. There is not much to see along the way however I did see some gypsies this time that was fun they had an actual gypsy wagon. so basically some hills in Kansans with some windmills large and small and then flat Colorado until you see mountains popping up out of nowhere, foothills be damned! so that way is pretty boring I recommend a book or 2 on cd.