Driving north of the Mendes Ranch the two-lane black top becomes a squiggly cliff-hanger. At one of the turns, near mile marker 7, is a little bridge and an unsigned trail that drops down a waterfall and pool. You'd never know it was there.
A scramble-down trail from the first falls (minor stream rock hop required) leads under the shade of massive banyan trees to a rock ledge. From there a rope aids the way down beside a second falls to a large swimming pool that opens to view down the overgrown stream valley. A few locals frequent the place, and a low-key adventure company shows the way to a smattering of hearty tourists. Maui Trailblazer has more details.