Walk up the road from the staging area until within 3 switchbacks from the top. Here the trail leaves the road on the right side, and descends slightly and then contours the ridge upon which the proteccion civil facility is constructed. Once past the toe of this volcanic ridge, the West Ridge will be visible. A shrine with a small statue and a couple of plaques will be passed on the right (on the climber's left) enroute to the ridge. A steep ash-covered slope leads to the beginning of the ridge proper.
The West Ridge leads directly to the higher of the two summits. Stay on the spine of the ridge until you reach the large metal cross on the top. The rock is more slippery than most, consider this on the 3rd class sections.
If you have sticky rubber approach shoes, bring them. Sticky rubber is not necessary, but it makes the climb nicer. It can easily be done in a pair of hikers or tennies.
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"Maintain thy airspeed, lest the earth rise up and smite thee."
--Unknown, possibly attributed to Wolfgang Langwiesche, author of Stick and Rudder