Our 2.5-mile hike started with a short ferry ride from the visitor center across Lake Ohakuri to the “Hidden Valley.” From there, we followed the self-guided 1.5-mile loop through a "Hidden Valley" filled with some of the most active geothermal features in New Zealand: colorful silica terraces, active geysers, steaming vents, bubbling mud pools, and the unique Ruatapu Cave