Even among Hawaii's many wonders, this national park stands out: its two active volcanoes testify to the ongoing birth of the islands. Majestic Mauna Loa (13,677ft) looms like a sleeping giant, while young Kilauea - the world's most active volcano - has been erupting almost continually since 1983. With luck, you'll witness the primal event of molten lava tumbling into the sea. But the park contains much more - overwhelming lava deserts, steaming craters, lava tubes and ancient rainforests. For hikers, it's heaven.
