In emphatic Berlinerisch, visitors to the little snack bar and beer garden on the Insel der Jugend in Treptower Park are told not to even ask about fries. But there’s Flammkuchen, steak grilled to order, and other specials like homemade ravioli and cake. And cold Staropramen on tap. So no problem. You can also rent a vintage canoes or brightly-painted medal pedal boats at Kanuliebe. Not bad for a tiny island in the city.