The lake has no fish because it is very cold. Its dead calmness adds to the flavour of the place. I wanted to do the zip line but, then looking at my weight, decided against it. I, as it is, wanted to go right on top of the lake, get in the zip line and jump into the lake. But alas, that was not allowed. The lake, I was told, drains in the rain and fills up in the dry season from underground sources.