Bar Harbor, Maine, 280 miles north of Boston, there is one of the coolest places to spend a few days chilling, biking, hiking, and especially eating tons and tons of lobsters with local craft beers. https://www.visitbarharbor.com/
Next to Bar Harbor is the Acadia National Park ( https://www.nps.gov/acad/index.htm ), one of the earliest US national parks to be established.
It was really fun to rent mountain bikes and ride on the carriage roads in the park where only hikers, bikers, and horseback riders are allowed.
When we were there in June 2011, we had perfect sunny cool weather but we kept running into people who told us that they have not had any sunny day for over 3 months 😀