Mt. Ka’ala Trail 5 Summary The trail to the summit of Oahu’s tallest peak, the 4,025 foot Mt. Ka’ala is considered one of the toughest hikes on the island.  One of the factors that makes the trail hard is that it has an elevation gain of nearly 3,500 feet that may be too much for … Continue reading Best Hikes on Oahu: The Mt. Ka’ala Trail (Waianae-Kaala)