You could drive from Vegas to the parks in Utah, then drop down to the Grand Canyon. Then head over to Mesa Verde. You could also drive across New Mexico. White Sands National Monument is beautiful. You can drive into the white sand desert and it looks like you are driving through snow. The Million Dollar Highway in SW Colorado is a another good suggestion. Beautiful drive.
If you went north, you could drive through the Tetons, Yellowstone, Big Horn Mountains, Devil's Tower and then drop down toward Denver. It really depends on how much driving you want to do each day. Little Bighorn battlesite in Southern Montana is fascinating.
Really there is so much to see and do it's difficult to decide. If you want any more detailed information on the sites I have listed, PM me.
Scott
