Doing my typical yearly South American sabbatical during the oppo of tourist season to both save $ and be unique.I will arrive on December 9th but I dont know how long due to bad Peruvian weather in Dec.I want to plan it well by looking at forecast every day and selecting the Macchu Pichu field day to be on a half way dry not overly cold day.I will need at least a whole day dedicated to that and since the forecast can only be gotten 10 days in advance I may need more than 2 weeks in country in case im very un lucky.Do I have to have a specific departure date to give to officials upon plane arriving is my question, tanks