Close to Waimea Bay you can find the Waimea Falls. It costs you around 9 bucks to get into the Valley. The path gets divided at some point and you can decide if you wanna walk to the botanical garden or to the waterfall area (of course you can visit both). While you're walking your way to either the botanical garden or/and the waterfall you're surrounded by beautiful nature. Once you arrive at the waterfall area employees are waiting for you and you can get a life jacket and can get into the waterfall. :) It's a really cool experience and you can get really close to the waterfall.