OK it is not the best photo (taken from above) or the best time to visit a waterfall (not much rain) but this waterfall is easy to reach and is located a beautiful forrest of big trees. It is located about 12km west of Chiang Klang. There are signs and the road is good.
And you can really swim in the pound at the lowest level. There are stairs going up to the next levels where you can also swim.
If you want to eat & drink something you will have to take with you as there is nothing for sale.