This is an amazing place and one of my favourites. The turquoise waters were stunning. The locals also come here in the busloads so if you can, walk it (there is pedestrian walkway). In that way, you stay away from the local crowds and you can soak your feet in the waterfall after a long day of walking.
There are supposed to be pandas in this park but we never saw any. That was the only down side.
We stayed overnight in the park - make sure you ask for a place with Hot water. They heat up the waters in order to give you a much deserved shower.