What to do in Brooklyn

I am sooo not familiar with Brooklyn at all. My friend is in town with her family (husband and 3 year old daughter) from Chicago. We are meeting them at their hotel this Sunday at the Marrriott in Brooklyn.
We were gonna have the kids swim at the hotel a bit and then go out to dinner. If the weather is nice go check out the Brooklyn bridge or gardens.
Any ideas to eat? My boys are 9 and 7 and like anything. Not sure about her DD.
There's a Rocco's Taco's right there, but thinking this Sunday it will be insane.
Someplace fun with good food and drinks we can possibly make a reservation at.

Re: What to do in Brooklyn

We make a whole family daytrip out of Industry City in Sunset Park- it’s a bunch of old warehouses that have been converted to really cool food halls/shops, bars where you can set the kids up at a table while you have adult convos. The courtyards between buildings have play spaces, thought I saw mini golf. There’s rollerskating, interesting desserts, one whole spot was all ginger liquor and NYS craft bourbon...could’ve stayed there alllll day.