Drive.
Mount TantalusTantalus-Round Top Drive: Oahu’s Only State and National Historic Road Tantalus-Round Top Drive is an 8-mile, two-lane paved road that begins at the entrance to Punchbowl National Cemetery. The roadway climbs Tantalus Drive to an elevation of 1,800 feet and then descends along Round Top Drive. The...
https://tantalusoahu.com/about/national-historic-road/
Pali Lookout is also a pretty cool stop.