Hey Dan, I can tell you about a few tolls (depending on the route you decide on) that I know of between Hershey and CT. Interstates 76, 95, 87, 90 are toll roads. Eastbound river crossings (Delaware River on I78, I80 & Hudson River I84,) are toll free (they'll get you on the way back westbound). Except Tappan Zee (I87/287) & NYC crossings, I think they're the other way around.
If it were me, I would take US 15 north to I81 (Harrisburg) north to I84 (Scranton) east all the way into Mass. (then pick your route to Plymouth, unsure of tolls out there). Less tolls and cheaper to cross rivers
A variation of that route is I81 to I78 into N.J. then I287 north to I87 (toll) (N.Y, N.J border) north to I84 (Newburgh, NY) east. (Less mountainous travel)
If you travel the toll roads, they'll either get you periodically or when you get on or off an exit (NY).
Many ways to get there some with a some without (many) tolls.