I come to New York city every year. This is the most tourist-easy spot on Earth.
People can't understand me in Rio, they pretend that they don't understand me in Paris.
LA is an almost English-speaking town, but its locations are very hard to find. New York is ideal.
I can give a couple of advices:
Learn this place on the plane, using the Rough Guide directory, and Unique Media map.
Don't flash it on the street, behave like city folks. Hide cameras under the vest.
Avoid vendor's meat, go to KFC.
Wear dark colors. Walk faster.
Start with Times Square.