and Mauna Loa, one of the largest in the world. Visitors can hike across the floor of a dormant crater, view ancient petroglyphs and steam vents, and stroll through a primeval rain forest to an ...

You'll be trekking through forests and sharp ... a composting toilet, and rain catchment water (which you'll have to purify before drinking). The Mauna Loa volcano crater is 30 minutes down ...