Very nice hike, very steep, it took us 2 hours up probably since we stopped so often to look for birds. Once you get to the top, you must hike down inside the crater to access the lake, it was completely socked in and we could not see anything. Very disappointing and also cool and eerie. The access is from the private property of the Arenal Observatory Lodge- you have to pay a small fee to access their property. We hiked in the property before and after the actual Cero hike and found it lovely and very quiet. The birdwatching was great and the views spectacular. We spotted a coati (which we followed for a good 10 minutes), an anteater, tons of parrots, parakeets, woodpeckers, swallow tailed kite, golden olive woodpecker, jacana, guan: really great spot!
Do not hire a guide for this activity, it's an established trail, you only need to pay for day use of the property.
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