We're glad we did this climb -- the acid lake and views from the top are worth it. However, be aware that it is sold as an 'easy walk' and it's not. After a downhill start (which, of course, us uphill on the way back), this is an uphill climb that ends at about 8,000 feet -- high enough for the altitude to impact some people's climbing stamina. Our 'guide' compounded the problem by setting a very aggressive pace and not providing rest stops. He would get far ahead of the stragglers in our group, finally wait until they caught up, and then start moving again as soon as they arrived. He literally ran up the last portion and intentionally chose small 'shortcuts' that eliminated little bends in the trail by allowing you to climb more steeply uphill. In a nutshell, he was awful. Mauricio was his name. Anyway, bring lots of water (at least 1 liter pp) and an energy snack or two. The view from the ridge is spectacular, and the very green acid lake is quite unique. The economics of the thing are a little puzzling. They charge an entrance fee for the park, and then a separate fee to climb (although no one would to to the park and not climb), and then, about a third of the way up, you pay another fee, apparently for crossing someone's private property. Altogether, it's about $13, so not a lot of money. I suggest a decent pair of hiking boots, although some choose to wear sneakers/tennis shoes/whatever you call those things. There may also be an ice cream vendor at the top. He was a nice guy -- he didn't have change for me, but he gave me the ice cream anyway with a promise to pay at the bottom.
If you are taking the bus, be aware of the time, as the last bus leaves at something like 4pm.
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