This Dunkin' Donuts, located on Williams Avenue in Mystic, offers a selection of all-day breakfast items such as coffee, donuts, breakfast sandwiches and flat-bread lunch items. Limited-edition seasonal favorites are also offered, including pumpkin doughnuts, pumpkin coffee and cider. Boxes o' Joe and large quantities of donuts are always available for gatherings or parties. Grab and go or eat in and enjoy lounging in the cozy club chairs and sofa.