Part of Aventura Extrema and on this river since October 2001, with a national tourism registry number (RNT 04301930097) — worth checking for, because the adventure trade here runs from established camps down to a man with a trailer.
They run the standard Pescados descent, rappelling, ziplines and temazcal, and sell the weekend package with meals and a bed at their camp on the bank. Office hours are weekdays; the river runs every day.
No street address is published, so this is pinned on the village.