I highly recommend heading through the Ozarks of Missouri and Arkansas, and then making your way to New Mexico. NM is bar none the best riding I have ever done, the scenery and the roads are second to none, and they are also practically no traffic anywhere "that can be good or bad LOL". You must hit the Devils highway in Arizona, it makes the Tail of the Dragon seem pretty tame in comparison. There is no question that you MUST hit Colorado, once you visit there you'all understand why. Head out to the West coast from there, then head North and hit everything up there on the way back home.