The Mae Sa Waterfall was actually a series of 9 or 10 small waterfalls and cascades spaced anywhere between 100m to 500m apart from each other. Depending on your criteria, one might think there would be more than ten waterfalls while others might think there would be less. But in any case, we thought that the most interesting of the ones that we counted were the waterfalls identified as 4-8 as these seemed to be more photographable and had interesting shapes.
Most of the falls were signposted so we could identify them. But I tended to think of this attraction as more of a Thai picnic and swimming spot. That was because none of the falls individually were more than 10m tall I reckon, and we saw many Thai holiday-makers picnicking with friends and family. In fact, it was quite a popular place despite us showing up in the late afternoon, which didn't leave us a whole lot of time to experience all the waterfalls before it started to get dark. Thus, our visit here felt kind of rushed.
The way we did this excursion was by walking up to waterfalls 4-10 from the third and uppermost car park (out of three car parks). From there, we took the well-developed walks uphill all alongside the stream seeing one waterfall after the next.