Thread The Needle

You will have to get wet and start in the water so bring some shoes you don't mind getting wet or go barefoot. Its a bit tight as its more like a hole your squeezing (off width) through.

At the bottom of the falls on the right is a little over hang that you will notice has the hole in it. sit on the water under the whole pull up and squeeze through it can be a bit tight at a point. In this picture it is right by that little shrub on the rock closest to the foreground.