Very nice scenery, better than your original planned route. Easy pass that you barely notice leaving Cuzco after the ruins of PukaPukara, then drop into the Valley at Pisac, more ruins. Once on the Valley floor, you are following the Urubamba River all the way down into Ollanta, more Inca ruins. At the town of Urubamba (on the river of the same name), you are around 9400 ft and Chincheros is around 12,400 ft so that's your pass. Really, it's a pretty easy 3000 foot gain +/- but it does seem to go on for a bit! Lots of nice single tracks outside of Chincheros and nice views of the mountains.