The Perch has decent sandwiches and pizza, and you don't have to be naked. Also, it's not ON the beach, but in the square at Orient Village, but check out Yellow Sub. They have rotisserie chickens, great burgers and wraps, etc. Especially if you're going someplace like Club O, where you can bring your own cooler, you can bring your cooler to the beach, so you could stop most anywhere and pick up some great snacks to have for lunch. Those are some of my favorite lunches.