Expect to climb about 8 km along a primitive path and then on the pumice rock once the trail ends. Bring a coat and camera. The guide provides marshmallows to toast over a volcanic vent. Views are phenomenal if you are fortunate in timing the trip during a clear period. If cloudy, it's only spectacular. Horses available to carry you most of the way up (or down) but not necessary if you are reasonably fit.
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