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Go to San Bernardo either by microbus or by hitchhiking. I hitch hiked there but had to wait 1 hour to get to San Bernardo. There you will find a bus station next to the Ruta 5. It's actually not so good here, you can have more chance hitchhiking from the access ramp a little before (-33.581348,-70.714067). People leaving from the Shell gas station can pick you up.