The South American Explorers (Choquechaca 188, Bell 4. 084/245-484. www.saexplorers.org. May-Sept., weekdays 9:30-5, Sat. 9:30-1; Oct.-Apr., weekdays 9:30-5) is a membership organization. Its US$50 annual dues get you a wealth of information at its clubhouse in Cusco, as well as in Lima and other South American cities.