New York City’s Official Visitor Information Center  - can be found at 810 Seventh Avenue between 52nd & 53rd Streets. Phone: 212 484 1222. Opening hours are Monday to Friday 8:30am to 6pm, Saturday and Sunday 8:30am to 5pm. Here one can find general information on a wide range of topics geared towards the New York visitor. There are also internet connected PCs here free of charge.

Official New York City Website  – this website provides news and information on all aspects of city government, including a special guide for visitors.

CityPass New York – this website allows visitors to purchase combination tickets to multiple New York attractions at a discounted rate.

Viator New York - this website allows visitors to book tours and day trips in New York City

Here is the link to Inside United States: Tourist Board Info. It provides access to the tourist information sites for all the states and the major cities around New York. It is useful for both international tourists and domestic visitors to New York City.