North of Waimea and southeast of Kapaau on the Big Island, the Pololu Valley Trail (aka Awini Trail) is a scenic valley from the lookout down into the valley floor on the ocean coast. Expect to find lush jungle and waterfalls.
The trailhead is located at the end of SR270 near milepost 29.
For more adventure, you can continue hiking southeast from the Pololu Valley floor over into Honokane Nui Valley on the Awini Trail. Its about a 2 hour hike from the trailhead, each way. It requires hiking over a 600 foot ridge to then drop down into the valley. It can be a wet and muddy route. It ends at a rocky beach. Do not swim here since it can be treacherous.
Overall, Pololu Valley Trail is the 28th most popular hiking trail of all 45 hikes in Hawaii.