Waimalu Ditch Calendar When: May 8, 2016 all-day 2016-05-08T00:00:00-10:00 2016-05-09T00:00:00-10:00 Hike We descend steeply, then follow the remnants of the old water ditch trail into Waimalu Valley. Our wandering ends at a nice lunch spot next to a fresh water pool suitable for swimming.