From Shiprock head over on US 64 to Farmington, then use NM516 to US550 in Aztec and follow it up to US 160 between Durango and Bayfield. No significant hills except right when you get close to 160 there is a short, steep, down grade with a curve, but you will be on the inside so no riding the guard rail. US 160 from the junction to Pagosa is curvy but mostly flat.
You can stay on US 64 all the way over to US 84 between Chama and Pagosa Springs then turn north but if you are that far south you might as well stay on 64 to Chama and use NM17 over the pass to Antonito and pick up US 285 to Alamosa. The NM 17 pass over to Antonito is not as high, curvy, or steep as Wolf Creek but Wolf Creek is not as bad as it was 50 years ago when it got its reputation, before they widened the road and eased some of the curves. US 64 wanders across some of the Apache reservation and is not well traveled. However it is not a bad road, but watch out for livestock as some parts are open range.
Either way has some great scenery. 160 is greener and 64 is dryer.
5er/2500Duramax/18ftBoat