The ArtCliff is no theme diner. This place is the real thing: Cupcakes and pies sit temptingly under glass; 1940s ads for $1.25 boiled dinners and 15-cent chocolate pudding decorate the walls. Most authentic of all? The reasonably priced portions of comfort food, including smoky seafood chowder, grilled cheese, and basil, corn, and lobster frittatas. 39 Beach Rd., Vineyard Haven, 508-693-1224.