Welcome to Pololu Valley
The area was once abundant with wetland taro, when Pololu Stream carried water from the deep, wet interior to the valley floor. When the Kohala Ditch was built in 1906, it diverted the water for sugar production. Unlike its sister valley, Waipiʻo, Pololu Valley has not been inhabited since the 1940s. So, instead of territorial residents, you are met by a forest reserve.
If you're going to hike into the valley, be prepared for a series of tense switchbacks and steep drop-offs, but with that said, walking into the Pololu isn't as intensely difficult as trekking the Waipiʻo.