RIO DE JANEIRO, BRAZIL - Sun, river, mountain. In the Las Melosas sector of Cajón del Maipo, the fresh air suddenly turns into cold gusts. The voice of guide and teacher José Luis Guzmán can be heard: "Watch out for the wind, don't let it blow you back and forth," he says to a student of the Ecotourism Administration course at UNAB, who is practicing the technique of descending a mountain with ropes, known as rappelling.
Catalina Rivera is in her first year at the Viña del Mar campus, so the sea is her thing. "This has . . .