You step onto a wooden platform and the rainforest exhales around you: humidity, leaf-mussel scent, and the constant drum of water falling into plunge pools below. A guide clicks your harness, checks your connection, and gestures toward the cable that angles out toward the cataract. For the next three hours and change, the landscape of Phou Khao Khouay will trade places with the city. The zipline here doesn’t just skim the canopy — it passes a waterfall, the cascade acting like a natural metronome that measures the runs.