Concierge.com's insider take:

After 40 years, the Lobster Roll remains the quintessential Long Island seafood joint. Also known as Lunch, thanks to the sign on top of the roof, this seasonal spot welcomes families with a kid-friendly menu, a warm staff, fast service, and a casual dining space. Groups gather on bench seats for bowls of mellow lobster bisque; tender, well-spiced crab cakes; old-fashioned egg creams; and, of course, the famous lobster roll—a classic that comes on an overstuffed hot-dog bun, with creamy mayo and crunchy celery. (Open April through November; weekends only before Memorial Day and after Labor Day. Their other location is at 3225 Sound Ave., Baiting Hollow, Riverhead; 631-369-3039.) Less flashy and storied, the Clam Bar, in a diminutive red roadside shack a stone's throw down Montauk Highway, serves up quality fried clams, burgers, and, to some minds, a superior lobster roll. Eating this close to the road is like driving in a convertible—the wind blows your hair, and it feels like summer. Plus there is something comforting about the nonambience and limited charms of picnic tables shaded by umbrellas and the posted warning signs about letting children wander freely (2025 Montauk Hwy., Amagansett; 631-267-6348).