Well, For Americans living in the North East region of the United States of America, the auto club AAA (Triple A) offers bus trips regularly to New York City (aka.the greatest city on Earth) regularly. They feature rides to the metropolitan museum of art, the American museum of natural history and even a "day on your own" tour. They even will get you advanced purchased tickets to the featured attractions at both venues. It's convenient and helped us bypass the incredibly long lines at both venues. Its definitely worth looking into for the day visitor. BTW, the "Underground" is called the Subway in USA, FYI.
Underground is the best way
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