I recently did the Colca Tour - Culture And Nature Tour In Colca Canyon. It was great. The tour is designed for max 6 people but we were the only ones who booked for that day. The guild was Umberto, who was very knowledgable and friendly. During almost all of the tour we were the only tourists at the stops. The only problem was that Pablo Tours requires a western union or moneygram deposit. I had a lot if trouble with western union, where my credit card canceled payments and called me thinking it was fraud.