Gotham West Market is a food hall that works well for a first date because it isn't too large or bustling but still has a ton of seating and a nice atmosphere. Gotham West (and food halls in general) let you do dinner without comitting to "doing dinner" on a first date. Regardless of what you eat, get Ample Hills at the end.
Drink
Grab a beer or cocktail from Seamore's
Eat
Ramen, Jianbing (Shanghainese crepe), Pizza, Seafood and Ample Hills icecream are all at your fingertips.
Sit
Overabundant seating, some longer communal tables, some smaller high tops.