If driving, head up Tantalus Drive until you reach the very top of the Drive (past Nahuina and Kalawahine Trailheads). Pu‘u Ohia Trail will be on your left (mauka) side. Park in the parking area across the street from the trailhead on the makai (ocean) side of Tantalus Drive.
Please note that the Pu'u Ohia Trail (in yellow) is part of the Honolulu-Mauka Trail Network, comprising of 18 interconnected trails (in turquoise). The system may be accessed via the Makiki Arboretum Trail (dark blue) as part of an extended hike. The shortest route from the Makiki Arboretum Trail to the Pu'u Ohia trailhead is 2.7 miles.
The Pu`u `Ohi`a Trail starts across from the small parking area along Tantalus Dr.
Climb steadily up the side of Pu`u `Ohi`a (Tantalus) on two switchbacks.
Break out into the open briefly for a view of Le`ahi (Diamond Head) and downtown Honolulu.
Switchback one more time and then ascend gradually through a corridor of bamboo. Ignore side trails on the right.
Reach a signed 4-way intersection. Turn right and down on a paved
road. (On the left another paved road leads up to the summit of Pu`u
`Ohi`a and down to Tantalus Dr. and the start of the Kalawahine Trail.)
The road descends briefly and climbs steadily through a bamboo grove to reach a telecommunications installation.
Go around to the left of the installation and pick up a trail. Behind
the installation is a spectacular view of Nu`uanu Pali framed by the
peaks of Lanihuli and Konahuanui.
Descend gradually through more bamboo.
Enter a native forest restoration area through a gate in a fence.
Descend gradually through native rain forest with views of the Ko`olau Range.
Reach the end of the Pu`u `Oh`ia Trail at a signed junction with the
Manoa Cliff Trail. (To the left the cliff trail leads to Pauoa Flats and
an overlook of Nu`uanu Valley. To the right the cliff trail leads to
Round Top Dr.)