Rafting rather than trekking, and the range is serious: day runs on the Urubamba at Chuquicahuana and Ollantaytambo, three days on the Apurímac including the Black Canyon, eight days on the Tambopata, and nine on the Marañón — the last of which is one of the great river journeys of South America.
They also run the Cusipata River Lodge on the Urubamba, which is where the day trips break.
SERNANP-licensed; the phone matches the register. They publish no street address, so the pin here is central Cusco rather than an office door.