LOVE this part of town - such a great vibe... combo of hipster, hippy and just overall one of the coolest places I've ever been. Been years since I was in the city, so I've forgotten restaurants, but you can stumble into spot there and have a very New York experience ;)
I don't even want to think about the hours I've spent at this legendary bookstore. Every New Yorker in the world must own at least one book from here and if you go you'll see why. You can find stuff here you'll never find anywhere else. Bring a tissue--it's very, very dusty.
The pantheon feels most special when you get to experience with few people around... There's no lines, but there are people here all the time so it's another one of the places that you might consider checking out early in the day...