This adventurous version of the Ka'ena Point hike climbs the west end of the Wai'anae Mountains. Start by hiking along the pretty coast to a fenced nature preserve. Near the upper edge of the fence is an abandoned tunnel. To explore it, bring light and be wary of the crumbling ceiling. Next, scramble up the nose of the mountain on an intermittent trail past WWII bunkers with great views over the west tip of Oahu. Eventually you top out near the summit of Pu'u Pueo, site of a restricted government facility.
open accessno dogsyear-roundany vehicle
Park in one of the dirt pullouts at the end of paved Farrington Hwy. Avoid leaving visible items in your car as break-ins are common. The hike begins by walking west along either the shoreline or the dirt road paralleling the coast.
If you have 4WD you could shorten the hike by driving some or most of the way along the dirt road. You'll need a permit and a vehicle suitable for rocky, rutted and often muddy conditions.