You clip in, shoulders tightening around a harness that smells faintly of rubber and sun, and then the jungle takes over. Canopy light fragments through tall, glossy leaves as the only zipline roller coaster in Latin America lets out a mechanical cough and launches you into a sequence of turns and dives. The air here is thick with humidity and the metallic whisper of pulleys; toucans and howler monkeys punctuate the soundscape. For two brisk hours Fly Park Iguazú rewrites how visitors see this part of Argentina — from the ground-to-canopy perspective.