I actually advise against Citibike for first time visitors. Just being honest but as a NYC biking resident if you're not used to the area at all or dealing with the way NYC works biking isn't the easiest way to get about. I've had friends from Europe visit who are avid bikers who enjoyed the biking but got lost (even in the grid) because of being flustered by the crowds. Once I told them which routes to stick to by using mostly the Broadway, east and west side bike baths things were much more enjoyable for them. If you stay for some time after your work and get a bit familiar biking can be a fun way to get around.
Originally Posted by
Blumie
If the weather is nice and you are comfortable on a bicycle, I would consider getting a citibike pass rather than (or in addition to) a metrocard. It's a faster, cheaper, more exhilarating, and obviously more scenic way to get around the city. Since the program came into being, my subway use is down well over 90%, as I use the subway now only in inclement weather or when making a rare trip above 59th Street).