Ride the Red Line to the Cambridge-Arlington border and the Summer Shack, a perfect example of what happens when an acclaimed chef (that’d be Jasper White) embraces casual, family-friendly dining: magic. The clam shack is a New England beach institution, and this cavernous space feels like an extra-extra-large one. The menu matches the seashore ambiance—raw and cooked shellfish, lobster rolls, hot dogs, all sorts of fried seafood—with the added zing of gourmet lobster preparations and amazing specials. The Summer Shack in Boston’s Back Bay is less atmospheric but still delicious; it’s especially popular before and after Red Sox games and Symphony performances.