Amazing article! I agree with Dan! I live in Tilcara (Jujuy, province) It´s quite near Iruya (just 100km). The tourist offices always try to recommend the highlights in the area and they don´t know about trails. There are some incredibles trails, but most of people just hike on them. An epic trail in Jujuy: http://es.wikiloc.com/wikiloc/view.do?id=746014