Most visitors stay close to the action in Waikiki resorts, while some venture to Oahu's quieter North Shore or neighbouring islands of Maui, Kauai and the Big Island.

Scientists can’t know precisely when a volcano is about to erupt, but they can sometimes pick up telltale warning signs.

About two months before Mauna Loa spewed rivers of glowing orange molten lava, geologists detected small earthquakes nearby ...