U.S. News Insider Tip: Arrive to the trailhead by 5 a.m. to beat the heat and allow time for breaks so you can reach the summit by sunrise. You'll also want to bring a headlamp as you'll be ...

The hardest hike on Oahu is the Koko Crater Trail. After all, this is one of the best hikes on Oahu that includes upwards of 1,000 steps along an old railway track that brings you to Koko Crater.

Less than 6 miles northeast of the Koko Crater Trail lies the 2-mile round-trip Makapu'u Point Lighthouse Trail. Easier to trek than the one at Koko Crater, this free trail overlooks the Pacific ...