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Alternately, Chatfield Reservoir (chatfield is ~15 miles south of the city center)
Aowin suggests Washington "Wash" Park (+always lots of people, +right in the middle by I-25, -[http://en.wikipedia.org/wiki/Washington_Park,_Denver| big park], 165 acres, might be hard to find gathering, lakes, +playground, rich neighborhood (might get more complaints?)).
Also says there is also a good park next to the zoo, but likelihood of being bothered by police is higher?