Any good suggestions for lunch in the area or other things to do after our museum visit? We are a group comprised of one adult, a 21 year old, two 18 year olds and a 15 year old?

There is the High Line Park and Chelsea Market . Good place to visit and eat.

It's been mentioned but I also vouch for Chelsea Market. It's a short walk away and has plenty of options.

I would also suggest Chelsea Market. Or any close by place (TAO or Old Homestead come to mind)

We went around last night around 6pm and went to dinner at lasagna ristorante after for dinner a little pricey but good food. But if you head uptown on 8th Ave we must've passed at least 15 great looking restaurants within a 5min walk. Barebuger and this taco spot to name a few that we were debating on.