Dinner with friend - Gramercy/Union Square/Murray Hill
Salvation taco- kind of a scene but the food is great
Casa mono, sit at the bar- razor clams and cauliflower a la plancha are favorites
Terroir is a great wine bar with small plates food that is good, but the wine is the focus there (they are having a summer of reisling promotion, lots of options by the glass)
How late is late? Regardless, Terroir in Murray Hill was very lively when we were there last month at midnight/1:00. The small plates we had were pretty good (the bone marrow stands out in my memory right now) and of course, big plus if you're wine drinkers. Your age group fits for sure!