Kimball Farm is a good stop, right off 495 and the kids will have fun.
I don't know of any factory tours on the way, but I think I'd stop in Kittery on the way up, and visit Yummies Candy store for a treat for the kids:
Other nearby places in the Kittery area that let you sample would be the Stonewall Kitchen company store, and When Pig's Fly bakery usually lets you sample their different types of bread.
The Redhook brewery is right off I-95 in Portsmouth and they have a little factory tour, but I don't think the kids would be too interested.
Not a factory tour in the usual sense (and doesn't involve an edible), but from I-495, you could stop at the Lowell National Historic Park to learn about the textile mills.
If you take I-95 instead of 495, you could detour to Saugus to learn about the early iron industry.
Finally, another detour off I-95, but one that involves candy, is a stop in Salem, MA for a tour of Harbor Sweets (if interested, call first to be sure you can tour that day).
with these responses i may never make it to old orchard beach.
PEZ candy in orange CT is fun for the kids
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