Just before Manoa Falls, the marked ʻAihualama Trail heads up to the left and scrambles over boulders. The trail quickly enters a bamboo forest with some massive old banyan trees, then contours around the ridge, offering broad views of Manoa Valley.
Another mile of gradual switchbacks brings hikers to an intersection with the Pauoa Flats Trail, which ascends to the right for more than half a mile over muddy tree roots to the spectacular Nuʻuanu Valley Lookout. High atop the Koʻolau Range, with Oʻahu’s steep pali (cliffs) visible all around, it’s possible to peer through a gap over to the Windward Coast. The total round-trip distance to the lookout from the Manoa Falls trailhead is approximately 5.5 miles. You can also get to the lookout on tracks from the Makiki Valley and Tantalus Dr.