I would start here with a visit to Ghost Town Farm. Right now, however, the farm seems to be closed to visitors until Novella Carpenter works out a beef (bad pun) she’s having with the city of Oakland. I did notice on her website that she is participating in open farm days, so you could catch up with her there. You can also get that farm feeling at City Slicker Farms. It’s a very special place in spring and summer.