Fav art bookstore in the city (and the world?). Great place for inspiration and reference art, both new and vintage finds. Not very cheap but mostly quite worth it.
My friends, Dee & Ricky, recently opened up their own restaurant at the ripe age of 24 in the Clinton Hill neighborhood. I stop in here every now and then for the roti. Also, there's a really cool (Nigeria-owned) sandwich & smoothie spot next door that is not pictured.
The best underground shows you will find will have free pbr and models as far as the eye can see. They are rarely announced, so keep your eyes out for promising openings, especially with Milk Underground coming up.
Occasionally I'll look at the Manhattan skyline and wonder what it was like in 1931 when people around the world were saying, "Holy shit, did you hear what they just built in New York?" Just get up there and trip out about humanity. And be sure to keep an eye out for the unmarked locked door guarding a set of stairs leading to a hidden terrace that was originally designed as a fucking docking station for zeppelins.