Ka'au Crater Hike is the ultimate Oahu hike, offering waterfalls, valleys, ridges, and an incredible volcanic crater

Ka'au Crater Hike is one of the most challenging and rewarding hikes on Oahu.  All together, it takes about 8-10 hours to complete the 5 mile loop.  Hikers begin in the valley and hike up and around 3 waterfalls on their way to the crater ridge.  Take a dip in one of the natural pools before you get to the second half of the hike.  The ridge will take you all the way to the Ko'olau Summit Ridge briefly before bringing you back down into the valley.  An early start and a nice, clear weather forecast are required for this hike... along with a little grit.  This hike is not for the faint of heart and requires an above average fitness level.  Totally Epic!

https://www.journeyera.com/kaau-crater/

​http://www.honolulumagazine.com/Honolulu-Magazine/September-2013/20-Great-Oahu-Hikes/