I didn't go to New York City but my dad, grandma and husband went. So how do you see NYC in a day without pulling your hair out? They found a bus system citysightsny.com where they were able to hop on and hop off all day. A bus came through every 15-20 minutes. So, they were able to get off, explore and then get back on.
Some of the stops that were offered were: Times
Square, Madison Square Garden, Macy's, Empire State Building, Soho, Chinatown,
Little Italy, Site of the World Trade Center, Wall Street, Financial District,
Battery Park South Street Seaport, Lower East Side, United Nations, Rockefeller
Center, Carnegie Hall, Broadway Theatre District.
They came back with great reviews. My dad said that he used this type of transportation in Paris, London and other big citys as well. It's hard to see a city in a day, but here's to trying! - Rejoicing in the Present