What direction to travel from Hilo to Mauna Kea?

To travel from Hilo to Mauna Kea, you should head west. The journey typically involves driving along the Saddle Road (Daniel K. Inouye Highway), which connects Hilo to the western side of the Big Island and leads directly to Mauna Kea. The drive takes about 1.5 to 2 hours, depending on road conditions and traffic.