The setting is world famous: between Cusco and the iconic ruins of Machu Picchu reachable by hiking or a two and half hour journey by train. Cultural authenticity is a major element, from Peru’s exalted cuisine to local music and age old rituals. And in sync with the growing emphasis on sustainable travel, the accommodations at Las Qolqas are safari style tents-the luxury version-assuring minimal effect on the environment…