Battery Park City had the feeling of San Francisco. The sun was almost clouded over, but it was warm, and the breeze was cool. Mist floated in off the Hudson. The manicured lawn was dotted with white bodies. A woman in a bikini threw a Frisbee to a guy in a white cap and khakis. At the edge of the lawn a brown dog lolled on its side, its tongue hanging out of its mouth.