Better Tyme deli (used to be called Good Thyme Deli)
186 Main St, Northampton, MA 01060, (413) 584-6195
this is in northhampton proper and close to 91 -- good deli food - don't know where you'd picnic nearby really.
off the beaten path known as 91 ... Bub's BBQ. 91N to exit 19, right onto Rt 9E, go a few miles, left onto 116 North, and Bub's is about 5 miles up the road on 116. to mapquest use this address: 676 Amherst Rd, Sunderland, MA. they have picnic tables or you can take it to go. http://www.bubsbbq.com/home.shtml they have ribs, chicken, sides etc.
If you're trying to get to a destination in a hurry, go to the deli. If you're looking to explore western mass in a leisurely way, go to Bub's