When you need a quick Zen break by a duck pond, you don't have to wade through the campus of Montana State University. That little duck pond is lovely, but it's not a mellow scene.
It may not be the BIGGEST but Montana State University in Bozeman, Montana has such a great year-round duck pond on South 11th avenue. There are "Duck X-ing" signs, a huge population of healthy mallards and it's a great place to chill out for 10 minutes.