Travellers can purchase an unlimited Metrocard for the day ($13) to take the subway which is the cheapest option. Alternatively, taxis or Uber are more convenient, but more expensive especially during peak hours.
If you have more time, visit the 9/11 Memorial and Museum, stroll through the trendy neighbourhoods of SoHo and Greenwich Village, catch a Broadway show, or take a food tour of Little Italy and Chinatown. If you have less time, consider taking a hop-on-hop-off bus tour to see the city's highlights.