Here's a different activity. Ever been to The Skyscraper Museum? Did you even know it existed? Whether your kid is a budding architect or just needs to appreciate those giant towers about him a little more, head on down to this relatively new Battery Park City institution.
For added incentive, sign up for one of the cool, family programs they host every Saturday. This weekend it's Building Bodies where kids will learn about the different shapes of skyscrapers and then trace their body to make their own building, even create a whole skyline. Free, but advance registration is required.