Northwest of Honolulu and west of Haleiwa on Oahu, the Ka'ena Point Road is a very rough 4WD road along the coast leading to the namesake coast. This unimproved road is only open to licensed vehicles only.
To reach the 4WD/OHV trailhead for the Ka'ena Point Road from Haleiwa, head east on SR930 (aka Farrington Highway) past Dillingham Airfield. The paved road clearly ends at the beginning of Ka'ena Point Road.
Overall, Ka'ena Point Road is the 3rd most popular OHV & 4wd jeep trail of all 4 OHV routes in Hawaii.