I used to live in Boston back in the late 90s and I'm coming back to visit an old friend. It's been so long since I've been there and I've become much more interested in food since. My days are free to explore Boston (my nights are pretty much booked), so I'm looking for recommendations on cheap eats around town--I'm thinking I'd like to check out Coolidge Corner, South End, and Cambridge (central and harvard sq), but I'm open to anything, anywhere. I'm planning on visiting the Neptune Oyster Bar in the North End which I hear has a great lobster roll. Also, if anyone has any recommedations on good bakeries or markets, I'd love to hear about them. Is there anything that I shouldn't miss? Thanks!