Makiki Heights Drive. After approximately 1.3 miles you will intersect with Tantalus Drive. Turn right on Tantalus. Just over eight switchbacks and three miles of hill running later you will reach the peak. The road will become Round Top Drive, which will take you back down to Makiki Street and to your car.
Notes Be very careful of oncoming traffic.
Some of the switchbacks are tight, and drivers may not see you. Water is available at the Nature Center mauka of the pumping station. There is also a faucet along the Round Top Drive side, just below the Manoa Valley overlook. This faucet protrudes from the rock wall on the mauka of the road. It is hard to find, and doesn't always flow, so carry some reserves with you.