We drove on this road to Kapa'au from Kohala Coast and what a scenery we saw!
Unlike Highway 19, you would not drive pass hardened lava rock. Instead, you'll feast your sight upon beautiful rolling green hills one after another.
At one point, you'll drive pass a desert range where you'll see some cactus trees,several private horse ranches, and road lined by lush vegetation. On a clear day, you'll be able to see at least 3-4 different mountain ranges: Kohala, Mauna Kea, Hualalai, and Mauna Loa. If you look to the West, you'll see the Kohala Coast and also the Kawaihae Harbor lined by Pacific ocean.
There's a scenic point that you could stop and take in the vista. :-)
If you're not rushing to your destination, do savor the drive on this road.