'Aiea · US
ʻAiea Loop Trailhead
The ʻAiea Loop Trail is a 4.8-mile forested walk on the hills above ʻAiea, Oʻahu, beginning and ending inside Keaīwa Heiau State Recreation Area at the top of ʻAiea Heights Drive. Graded easy to moderate, it follows a ridge on the west side of Hālawa Valley, trading rainforest shade for sweeping views that stretch from Pearl Harbor (Puʻuloa) and the Waiʻanae Range to Honolulu and Diamond Head (Leʻahi).
Most of this hillside was replanted by foresters in the late 1920s, so the loop reads as a living lesson in Hawaiian forest: fragrant lemon eucalyptus, stands of Norfolk Island pine, and native koa and ʻōhiʻa crowning the high point at Puʻu ʻUaʻu. With about 900 feet of gentle elevation gain, a steep switchback and a stream crossing near the end, the hike takes roughly 2.5 to 3 hours—and it rewards those willing to slow down and notice the trees, the birdsong, and the layers of history underfoot.