Peru has some of the best biking in the world so lots of options. Have you considered making your trip a little longer? If you had more time you could go over the Abra de Malaga. It's a loop that goes up behind Urubamba, down into Quillabamba and then back into Ollanta. Great ride but you would need more time, or ride part of it, then grab a truck/bus to get back to Ollanta. 50% of something is better than 100% of nothing.