The best foods to eat are vegetables & fruits.
The best places to get them are:

1. Garden & Farm
2. CSA's & Farmer's Markets
3. Wholesale Produce Markets
4. Organic Grocers
5. Everywhere else.

A list of vegetables & fruits to buy organic and which to buy non-organic:
http://www.ewg.org/foodnews/list/

All about gardening & raw food with John Kohler!:

Gardening
http://www.youtube.com/user/growingyourgreens
Raw Food
http://www.youtube.com/user/okraw