Visit nycgo.com, which is the official guide to New York City attractions, on your computer.
Place your cursor over the "top attractions" link and click on a selected link to learn about the city's different attractions. Write down, using pen and paper, those attractions that you want to see while you are in New York.
Place your cursor over the "what to do" link and click on a specific link to learn about the events occurring while you are in town, as well as information about shopping, dining, entertainment and other activities. Using pen and paper, write down the dates of particular activities and events that you want to do.
Click on the "maps & guides" link on nycgo.com. Use the different city and neighborhood maps to group by their locations the attractions and activities that you want to experience.
Click on the "subway map" link and find the best public transportation routes to reach your chosen activities and sites.
Start with the locations nearest your hotel and design your itinerary each day, filling each different day with attractions and events that are relatively near each other and noting the specific buses or trains to reach each event.