I was surprised there were currently no caches at Beaver Pond! Beaver Pond is a town beach that also has a playground and football/soccer field. To learn more about the town conservation properties, check out this PDF: http://franklinma.virtualtownhall.net/Pages/FranklinMA_Conservation/Trailguidev1womaps.pdf
Note that in the summer, you do have to pay to park, as it is an active town beach.
***There is an unactivated travel tag for the FTF***