San Juan is a city in Argentina and is the capital and namesake of San Juan province. The Ruta Nacional 40 passes through it.
Hitchhiking out
South towards Mendoza
Take the Ruta Nacional 40 southward. There's a gas station named Oil (yep, it's a brand) about 15 km south of the city center. Try to take a city bus to Villa Krause or even better, Villa Nacusi. Please add more info (like a city bus number) if you have it.