The massive Hualalai Volcano looms over the town of Kailua-Kona on the Big Island’s western coast and is lesser-known than its more popular neighbors, the Mauna Kea, and Mauna Loa. Hualalai is still considered active and is expected to erupt again within the next 100 years. Hawaii’s famed Kona coffee grows on its slopes and the area is a popular hiking attraction.