I would agree with above, Pagosa to Alamosa on US 160 over Wolf Creek Pass. It is a high pass at about 10,850', but not bad. Very good wide 4 lane (2 up/2down) highway going up. Fairly steep grade going up the west side, but you can just stay in the right lane and take your time and not hold up traffic. Plus a number of pull outs if you want to pull over.
Going down the east side is not as steep. Just pay attention to the speed limit signs for the few curves there are.
You would have to detour nearly to Santa Fe to miss mountains altogether.