I'm planning on dumpster diving for some extra calories on my upcoming tour. I know many of you will probably frown at this, it sounds gross if you've never done it. From my experience i can usually find bags full of bread from bakeries with no trash mixed in and other pretty sanitary food like whole pizzas still in the box just sitting on top. I always carry a little bottle of hand sanitizer though JIC my hand gets on something gross.
Some of my favorite places: Starbucks, Natural food stores, pizza places, panera bread (and other bakery/delicatessen type places.) I found a dumpster full of books at Borders the other night.. got some star wars and even JRR tolkein books. mostly crappy romance novels though.
America has the richest waste in the world. sometimes i can't believe the things people throw away. When I have so much food me and my family can't eat it all I drop it off at homeless shelters, or just pass it out to bums on the street when i'm coming home from a night of dumpster adventures. Oh, and i've never gotten sick. i'm really careful about what i take. sometimes even after i get home with things if i have even a moment of second thought i throw it in the compost.