Last summer we did a drive/camp trip up the coast from CT. We stayed in Nickerson State Park in Cape Cod (full plumbing/showers, on bike trail, can walk/bike to a number of beaches, $15/night), got a hotel for a night in Portland, ME (I love this town!), bypassed Acadia Natl Park this time, but have done it before and really enjoyed it, spent a couple of nights in New Brunswick at Fundy Natl Park, and continued up to Cape Breton Island in Nova Scotia for hiking and moose watching. Also, you're probably not that far from Montreal or Quebec City, and I really enjoy both of those destinations.