I broke my finger on Amasa Back a few years ago, right at the beginning which should be walked by 99 percent of us - it was more of bike walk for me than a bike ride as it was somewhat to technical for my riding skills and the bike I was on. HOWEVER am throwing it out there because if you are a skilled rider it is a beautiful ride and the view was stunning.
We usually rent a casista at one of the campgrounds - I like being off the ground and being able to shower after being in all the dust and sand.