Data plan for a week of vacation in NYC

Dear United Staters, your help is needed!

My girlfriend and I are planning a week of vacation in NYC in May and it would be ideal for us to have some kind of access to the interwebz to check for direction, restaurant, and attraction while on the go.

Are you aware of any short term data plans from US phone carriers or some kind of city-wide wifi services that could be useful?

My phone is currently a Nexus S and I plan to change for a Nexus 4 if the stocks arrive in France. I also have a Wifi Nexus 7

Manny thanks!