I loved the Agua Azul Waterfalls. We arrived at night and stayed in a very little not so cozy cabin, everything was dark and we didn't know what to expect but when the sun rised...
We could see from our room the emerald blue of the river flowing. Breakfast near the waterfall was great and all the walk up to the second swimming area is full of souvenirs and places where you can grab a drink or just some fresh water.
There are a couple of lookout points around the way up, I recommend checking them, nice to take pictures!
The second swimming area, which is maybe 500m ahead over the stairs was great. The water was so clean and so cool and it was not too deep (I don't know how to swim hehe), though in the middle of the river you could see people dipping in, I guess it was deep enough in the middle to do that.
It was a great experience and a very lovely place.
If you want to buy souvenirs do not forget to ask what is the lowest price you can get! -> "Cuánto es lo menos?" hehe.
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