I highly recommend all NYC residents get a city ID and head over to the Bronx Zoo to pick up Wildlife membership. This gives entrance to Bronx Zoo, Central Park Zoo, Flushing Zoo, Prospect Zoo and the Aquarium.
I only had a half hour today but I got to visit the penguins, my favorites in the Central Park Zoo. These two little guys were busy flirting with all their visitors.
Of course there are tons of other benefits to be had with this ID. I had to buy a new case just to keep all my membership cards together.