Old or torn US dollars are worthless in Peru :: Always carry chocolate for yourself and to share with others :: Remain mindful of who you tell your secrets too :: Avoid casual chatter of the mind and mouth on the Inca Trail; you will miss your summon from the mountains :: The dearest Peruvian friends that you meet will ask that you speak only in Spanish :: Prepare yourself to meet lifelong friends that only heights of 11,000 feet and beyond promise.