Da Ferdinando sits right on Spiaggia del Fornillo, its tables practically in the water. It has been a Positano institution for decades — simple grilled fish, pasta with local clams, and bruschetta eaten with your feet in the pebbles and a boat tied up nearby. The menu doesn't change much and doesn't need to.
The restaurant is only accessible on foot or by sea, which keeps the crowds manageable. It's cash only, and you should get there early for lunch in summer. The vibe is exactly what Positano used to be — relaxed, unpretentious, and delicious.