We stayed at the camp ground across the road from the falls trail for two nights with a group of sixty+ friends. I saw a large flock of mostly bulbuls (birds) in the trees along the stream and got a recording of what I believe to be a Blythe's frogmouth (bird) just after 7:00 in the evening. We also traveled along the nature trail to a cave above the base of the falls. To access it go to the right of the stream (don't cross bridge on road) opposite the ticket booth. You can also go up a trail slightly below the falls but it's harder to cross the stream and find the path. Along the nature trail we also saw/ heard several birds including a nuthatch or creeper and what I believe to be a Gray Treepie. Both the frogmouth and treepie are rare bird sightings. By the way it's pronounced Mok Fa (leave out the 'R')

Took a short hike to waterfall with our children. It was a very nice experience. Entrance fee was 100 baht for adults (I believe, my wife paid). Our children were free. Plenty of parking available, as well as a camping ground and other accommodation to stay overnight.