millbrook farmers market is fairly small. i went a couple of months ago for the first time...i can't give any recommendations for food stalls/produce stands, but you might want to swing by dykeman farm (http://www.dykemanfarm.com/) before you hit big w's. i love big w's pulled chicken sandwich (sensibly sized is more than enough for one) and their sweet corn pudding. delicious.
mckinney and doyle is quite good, but very busy on weekends (http://www.mckinneyanddoyle.com/). wild hive farm (http://www.wildhivefarm.com/) is a little out of the way in clinton corners, but worth a slight detour.