The short hike to the waterfall starts in the small village of Sop Keng. After about 30 minutes you reach the beautiful waterfalls. The largest is at the end and you can go swimming there.
The best way to get to Sop Keng is by boat from Nong Khiaw. There is also a road that leads there. However, the ground is loose and you have to cross several streams. By bike (or scooter) it is possible but not recommended (3.5 hours of cycling with many meters of elevation and a lot of pushing).