Hike Up to Waimea Falls
There are not many waterfalls on Oahu that you can easily access without hiking through brush and getting a little muddy, but there is one Hawaiian waterfall that is quite pleasant to stroll up to and that is Waimea Falls. It's located in the back of Waimea Valley, and surrounded by some beautiful botanical gardens. Reach the 15ft waterfall and you'll find a nice size pool of water that you can swim in as well!