Mauka is a Hawaiian word for "toward the mountain". These runs generally start by gaining elevation and are a bit cooler, as contrasted with "Makai" runs that go toward the sea.
Mana Road
Easy gravel road running on the northern slopes of Mauna Kea
• 0 to 41mi one way; turn around whenever • dirt, gravel road • Warm to Cool
Mauna Kea R1
A dirt road encircling 3/4 of Mauna Kea between 5800' and 9500'
• 36mi one-way • Forest road, puddles • Cool
Humu'ula Trail (Hamakua)
A muddy non-trail through the jungle
• ~10.5mi round trip (theoretical) • Forest mud, leaves • Cool
Mauna Kea Summit
Trail to the highest point in Hawaii
• 14mi round trip (7mi each way) • sand, rock • Cool
Tree Planting Road
Oddly straight road passing through several interesting life zones in the Waiakea Forest Preserve
• 20.2mi round trip (10.1mi each way) • Forest road, puddles • Cool
Flume Road
Hunter's road in the Upper Waiakea Forest Reserve
• Up to 13.5mi round-trip (We did 6.2 total) • Forest road • Cool
Mauna Loa Trail
The definitive climb up the long mountain.
• 32mi to caldera, 36mi to summit, round trip • rough lava • Cool
Hao Springs Road / Whale's Tail
Steep road climbing into the Ka'u Forest Reserve
• 3.4mi one way; 7.8mi round trip (option to extend) • Steep pavement, dirt 4wd road • Mild
Waterfall Road (Ka'u Forest Reserve)
A fun, wet romp through the dense forest of the Ka'u Forest Reserve to the top of a waterfall. But watch out for the aggressive dogs.
• 8.3mi round trip • Grass, mud, two-track, some rock • Mild
Mountain House Road
Easiest access to the Ka'u Forest Reserve.
• 13mi round trip • asphalt, gravel, mud • Mild