You'll need a 4WD vehicle to access the put-in at Waipio Valley. Explore a little ways up Wipio Stream before launching into the surf. Launch is difficult. You need to get an early start before winds pick-up and create a choppy sea. Towering cliff walls provide the back drop for this short paddle. Coming around the point, you'll arrive at Waimanu Valley. This whole area is a National Estuarine Research Reserve. You can paddle up the meandering, swampy stream or land and hike to a waterfall about 1/4 mile in from shore on the northwest side. This is a tough surf landing. The best channel is at the mouth of the stream. Camping is available with a permit. Any water you get here needs to be purified.