One thing that I often notice when I'm in US, and that I probably never will be used to, is that all stores and restaurants seem to have too many employees.
Wouldn't they make better profit if they let some people go?
Regarding New York. You can find some nice street art if you walk around for a while, but often the atmosphere and city pulse is enough to make you happy, so don't be sad if you don't see any.
Finding free Wi-Fi on Manhattan is very easy. Just visit McDonalds, Cosi, Starbucks or about any other food chain / cafe.
Hm, another thought. Why do most people in US wear jeans on wrong size? They usually have jeans that are at least one size too large, and I'm not talking about baggy models.