In an era of $24 martinis, a dedicated roster of neighborhood raw bars and seafood taverns still honors New York’s oldest happy-hour tradition: freshly shucked East Coast bivalves for $1 to $1.50.

Ride the 6 train to Pelham Bay Park and cross a short causeway into a 1.5-mile island where yacht yards, maritime museums, and waterfront seafood shacks replace the city grid.