B.F. Clyde's Cider Mill is a seasonal Mystic institution, known for its old cider press, fresh doughnuts, hard cider, and the smell of apples in autumn. It is the kind of place that makes most sense when New England is leaning fully into harvest season.
Outside the main season it is less central to a trip, but when open it is a very satisfying stop between Mystic's maritime sights and the surrounding countryside. Go for the cider-making heritage as much as the snacks; the mill keeps a working tradition visible.