If you are specifically interested in NYC tech scene, I would suggest a)looking for a tech meetup, b) visiting some start up incubator c)visiting one of many schools/universities in the NYC (last one would be least probable of being fruitful)

it might be tough to do much considering the time it takes to get to/from the airport. both jfk and lga are a good hour each way from manhattan.

what do you want to do?

I'd really like to visit a start-up and see what it's really like. I've never had a development job before.

If this is your first time in NYC, forget the tech scene and just walk around the city. And grab some good food.

I guess I could use a good leg stretch between flights. :P

It's said they write a song about anyone who eats dinner in NYC, like magic.