Best Hikes on Oahu With Views 2026 — Trails, Tips & Parking

Hiking Oahu in 2026 — What Has Changed

Several of Oahu's most popular trails now require advance reservations managed through the Hawaii DLNR online portal. Parking is the limiting factor at most trailheads — lots fill by 6:30am on weekends. If you are planning a summit hike, treat the parking situation as seriously as the hike itself. Below are the five trails that consistently deliver the best views, with current access details.

Koko Head Crater Railway Trail

Koko Head is 1,048 railroad tie steps rising 642 feet in under a mile. There is no shade, no switchbacks, and no relief — just a straight vertical climb up the spine of the old military tram. Do this before 7am or you will be hiking in direct sun on black lava in Hawaii heat. The views from the summit cover the entire Koko Head Regional Park, Hanauma Bay, and the windward coast. Parking is at the Koko Head District Park lot off Lunalilo Home Road in Hawaii Kai — free, large, but fills completely by 7am on weekends. No permit required. Total round trip is about 1.8 miles with 642 feet of elevation gain. Bring at least a liter of water per person. The trestle section over a gap midway up is not difficult but can be intimidating — you step across wooden ties over open air.

Diamond Head Summit Trail

The Diamond Head trail inside the state monument crater is Oahu's most recognizable hike. The 1.6-mile round trip gains 560 feet and ends at a concrete military bunker with 360-degree views including Waikiki, the Ko'olau Range, and the open Pacific. A reservation is required ($5/vehicle) through gostateparks.hawaii.gov. Book as early as two weeks before your date — weekend slots go fast. The trail includes tunnels, a 74-step spiral staircase, and a series of switchbacks. Most people complete it in 1.5 to 2 hours. Arrive at the parking lot inside the crater before 6am on weekends. The reservation system is enforced. Wear real shoes — sandals on the staircase are a problem.

Ka'au Crater Loop — Palolo Valley

Ka'au Crater is one of the most rewarding hikes on Oahu and one of the least discussed in mainstream guides. The full loop is approximately 5 miles with 1,500 feet of gain, passing three waterfalls before climbing to the crater rim with views across the Ko'olau Range. This trail is genuinely difficult — muddy, steep, with rope-assisted sections and stream crossings. A free permit is required through the DLNR Na Ala Hele system. The trailhead is at the end of Waiomao Road in Palolo Valley. Do not attempt this after heavy rain — the creek crossings become dangerous. Bring trekking poles, wear boots with grip, and expect to get wet. The third waterfall before the crater is worth every bit of the effort.

Manoa Falls Trail

Manoa Falls is Oahu's best easy hike — 1.6 miles round trip through dense rainforest to a 150-foot waterfall. The trail gains about 800 feet and stays almost entirely in shade. Expect mud. The trailhead is at the back of Manoa Valley, near the Lyon Arboretum. Parking at the private lot costs $7. Street parking on Manoa Road is extremely limited and fills before 8am. No state permit is required but the private parking fee is unavoidable if you drive in. The trail is appropriate for children with good shoes. Do not swim at the base of the falls — leptospirosis is present in the freshwater. The rainforest atmosphere and the dense green canopy make this one of the best photography hikes on the island without requiring a summit effort.

Lanikai Pillbox Trail (Maunawili Pillbox)

The Lanikai Pillbox hike is 1.8 miles round trip with about 400 feet of gain, ending at two World War II concrete lookout bunkers above the Lanikai neighborhood on the windward coast. The views from the pillboxes take in the Mokulua Islands directly offshore, the turquoise Lanikai beach, and the Ko'olau ridgeline behind you. Sunrise from the first pillbox is legitimately one of the best photo locations on Oahu. The hike takes 30 to 45 minutes one way. Trailhead is at the end of Kaelepulu Drive in Kailua — park on street along Aalapapa Drive. Street parking fills fast on weekends. No permit required. Bring a headlamp for the pre-dawn approach to catch sunrise. The last 100 yards to the second pillbox involve loose dirt and some scrambling.

Parking Strategy for All Oahu Trailheads

For any weekend hike, arrive at the trailhead no later than 6am. Most Oahu trail lots have 20 to 30 spaces. The Hawaii DLNR has added permit and reservation requirements to reduce trail overcrowding at Ka'au, Diamond Head, and several others — always check the Na Ala Hele portal before you go. Parking violations near trailheads are actively ticketed.