Trekking - Colombia Ultimate Adventure. Where the road ends, adventure begins. Venture in search of sublime vistas, mountain villages, and natural bliss, and return with unexpected treasures and memories. Tour requires as minimum as four people. *Caño Cristales can be visited from the beginning of June until November 30 of each year. This is a unique natural scenery that is permanently guarded due to its possibility of extinction, for this reason, can be closed without notice.