We went to cables extremos in early Jan 2014; the zip lines are very nice but a bit short for our taste (having done this before in Costa Rica), and you have to wait for everyone to be done with one line before going to the next, so it's mostly waiting and not so much action. The hike up is very nice, you get to see quite a bit of nature (if you're lucky, and we were!) including some monkeys and there's a Mariposario (butterfly dome) where you can see a nice variety of butterflies (and we happened to run into one of the people maintaining it who was very happy to answer our numerous questions!). There's also a part where you can see the larvae feeding, which was very cool.
As for the zip lines, the views are incredible, you can see the lake and the volcanoes in the background from high up, as you fly through the jungle. The ziplines seemed to be in great condition, no sign of oxidation.
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