Coming from Salta by car (RN 68), 50 km north of Cafayate you will find a really impressing landscape, called "Quebrada de Cafayate". These are red sandstone landforms like the Garganta del Diablo, El Anfiteatro, El Sapo, El Fraile, El Obelisco and Los Castillos (see the picture). They are very easy to find, because in every tourist information (Salta) they have maps with the names of the landforms and the distances between them on it. There are many tourists there, even (or most of them) from argentina. So you don't have to care about your car (lock up the doors). It is possible to climb into the Garganta del Diablo and, maybe there is a guitar player inside El Anfiteatro...