How can I see the most of NYC in a small amount of time?

I’m going to be in NYC Manhattan area for 3 days for the New York Comic-con Anyone else going? Lets meet up.
We are driving up early Friday morning, in hopes of getting to the hotel by about 9. and hopefully to the convention center by 10 or 10:30

We are leaving Sunday afternoon, probably around 6.

Now.. I’ve never been to NYC, and I really want to go exploring.

I’ll be at the convention from about 10–6 every day, so I suppose that only leaves us with nighttime exploring.

So… does anyone have any suggestions? Things to do? Places to eat? That are vegetarian friendly

Our hotel is 0.5 miles away from the Empire State Building according to Google, if that helps