HWent here with family and friends. It's in a cut spot so it's away from the major city. About two hours away from where we were staying but a nice drive.
You pay for your admission as soon as you get there and then get on a truck that takes you to the grounds. It's a nice scenic route.
Once you get there you get there you can either swim in the pool, in the river water, visit the waterfall, or shop for souvenirs. I personally didn't go up to the waterfall but I swam in the river water. It's COLD! Also a bit murky, it was hard to see clearly through it. The rocks at the bottom I could do without.
The river water is good for the kids, not that deep, I think a little over 4ft at the most. There were a lot of people and be sure to be careful on the big kids playing around your little ones.
If you want a seat, get there early. Whole families take over the seating around the water.
It's a nice place to swim and cool off and a break from the city. Would recommend it.