Use your $50 gift certificate at Larsen's in beautiful Menemsha. "Since 1969, the Larsen family of Martha's Vineyard has steamed sweet local lobsters to order, serving them with icy oysters and littlenecks on the half shell and piping-hot steamers and mussels. Eat your lunch at one of the makeshift picnic tables (inverted lobster pots) and buy some freshly harpooned swordfish or a beefy tuna steak to take home.