The Greenmarkets are the New York version of Farmers' Markets. The biggest and best is at Union Square (14th Street) - with multiple stands offering everything from fruit and vegetables to baked goods, meat, fish, milk, butter, ice cream, cheese, you name it! - much of it organic. A great way to support small farmers, get delicious organic food and see a fascinating part of the city.
www.cenyc.org/HTMLGM/maingm.htm lists the location of all the Greenmarkets. The Union Square Greenmarket runs along the West and North Side of the square. (Subway: Union Square - L,N,Q,R,W,4,5,6)
Monday, Wednesday, Friday And Saturday.