The first picture in the clip was taken in May and during that time, until late summer, the current is too strong. This is just the northern side of the waterfall though. There's a small island between both sides. On that island there's a cave which leads to another one, which is filled halfway with water. I have bathed there during August and underneath the north fall, when the current is much weaker. The tempurature was 20°C / 68°F, if I remembered correct. ;-)