It is amazing how so few people in New York City know Battery Park and appreciate it. It offers nature, a bicycle path, breathtaking views of the Hudson and the Statue Of Liberty, and a piece of calm right in the heart of the financial world. You can just sit back, relax and watch the yachts passing by or have a nice brunch at the World Financial Center. Seeing the 4th of July fireworks roar above the Status of Liberty never gets old! Battery Park is probably the best park for adults in New York City, frequented mostly by those who reside in the area: a nice, hip, polite crowd.
Pros: Water views, restaurants with water views, not overly crowded
Cons: A little strict on some rules, such as not allowing photography tripods