Pick Your Own Guide to New Hampshire
The New Hampshire Department of Agriculture, Markets & Food has a nice 6 page guide to Pick Your Own Farms in NH. Farms are listed by county and includes information on address, website, hours, seasons, crops and special events. You will find a large variety of New Hampshire grown fruits, vegetables, flowers and Christmas trees you can harvest yourself!
That is the 2006 version here is the newest version. http://agriculture.nh.gov/publications/documents/2006HarvestYourOwnWeb.pdf