NYC is really cold during winter. Even in April you need to wear your Try to arrange your visit for Manhattan during summer time.
SuperShuttle is the easiest and most cost-effective airport shuttle service if you don’t want to pay a lot of money for the taxi. Have a look at their website. From an example; JFK to Manhattan will roughly cost you 70 USD (one-way). This service is around 20 USD (one-way). You may use it for the entire cities in US.
Probably you are visiting NYC for shopping. If you are planning to get the tax refund, forget about it. Neither the state nor the city of New York refund the sales taxes. Read this essential information.
People always plan to arrange a hotel in Manhattan to be in the heart of everything. This is true but when they check the prices, hotel dreams move to the other side of Hundson river . This river separates New York City from New Jersey. As the hotels are extremely expensive in Manhattan, people usually arrange their hotels in New Jersey side. Prices are reasonable on that side and there is only one river to reach for Manhattan.
Keep your ID with you when you are hanging going out at nights. They always ask to see your passport or ID when entering a club, lounge etc.
As I have mentioned, this city has amazing rooftop bars. Have a look at this website to check NYC’s best rooftop bars and choose your favorite. We visited Press Lounge and the view was amazing. We were asked to show our passport while entering !
Jazz Clubs should be your second night activity. Check the best venues from here.
Don’t forget New York is a state and NYC is a city.