Manoa Falls Through the Green Cathedral

Manoa Valley sits behind the University of Hawaii campus, and the road into it narrows as the ridges close in on either side and the rain that feeds the valley's impossible greenness begins to assert itself. The Manoa Falls Trail starts at the end of Manoa Road, past the Lyon Arboretum, where the parking lot is modest and the trailhead sign is modest and the forest behind it is anything but.

The trail is 1.6 miles round trip through a tropical rainforest that earns the name — enormous monkeypod trees, bamboo groves that creak and whisper like instruments warming up, and a canopy so dense that the rain that falls on the ridge above reaches the ground as a filtered mist that catches light in ways that make the air itself seem green. The mud is real — Manoa Valley gets more rain than any populated area on Oahu, and the trail after a shower is slippery enough to humble anyone in sandals.

The falls appear at the trail's end: a 150-foot cascade dropping over a moss-covered cliff face into a shallow pool. Swimming is officially discouraged (leptospirosis in the freshwater is a genuine risk), but standing at the base and letting the mist land on your face while the sound of the falls fills the valley is enough. The water smells of earth and green and the mineral tang of wet rock, and the temperature drops ten degrees in the amphitheater the cliff creates.

Best time: Early morning on a weekday, when the trail is quiet and the light slants through the canopy in shafts that look staged but aren't. Bring shoes with grip (not slippers), bug spray, and a rain jacket — it will rain, because it always rains in Manoa, and that rain is exactly why the valley looks the way it does. The trail closes when flooded, so check the status after heavy storms.