Wailua River is Hawaii's largest navigable river. The current is slow. After about 2 miles, there is a fork in the river. Take the right fork to get to the Secret Falls trail. Look for a native hawaiian fishing village on the right bank near the fork. A short distance ahead, Take the left side of an island to the bank area. Here you can pick up the Secret Falls trail and hike an easy 1 1/2 miles to the picturesque Secret Falls. It is a 120' waterfall with a large swimming pool area. The river is a favorite with kayakers and so it is easy to follow the tour groups. Watch out for some large boats in the river and waterskiiers near the ocean confluence.