This is a great thread, I wish I could recommend some places but without too much detail here, we only were able to camp one weekend last year, quite a bummer to buy your first TT and not get to use it.
I've had many friends suggest places that were mentioned, X2 on jelly stone yogi bear in Sturbridge avoid it like the plague, pine acres in Oakham is a must try, sunsetview in monson is a possibility we will be checking that out this year as its very close to us so may be good for quick weekend getaway.
The only place we went is Westhampton KOA, we liked it but it is small and lots of seasonals we don't have much to compare it to they have activities every weekend for the kids I would put it in the ok category. We will be going back.
Can't wait for this season to start and hopefully actually get to visit some of these places.
2008 Dodge Durango
2015 Salem cruise lite 195bh