A travel agency in the centre of San Salvador de Jujuy, running the excursions up the Quebrada de Humahuaca. Their Hornocal trip is the one to know about: from Humahuaca it climbs 25 kilometres of dirt road to a viewpoint at 4,350 metres facing the Serranía de Hornocal, a mountain wall striped in fourteen colours that makes the better-known hill at Purmamarca look restrained.
They also run pick-ups from Tilcara and Maimará for people already staying in the quebrada rather than in Jujuy. At that altitude, go slowly and do not do the Hornocal on your first day in the region.
The pin sits on Calle Belgrano at street level rather than at number 601. Book by WhatsApp — they state it as their channel for enquiries.