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.
Yossi Milo is, in my opinion, the most dynamic and eclectic of the photography galleries in NYC. From portaiture to architecture to experimental digital sculptural giant animals to street photography, they show an endlessly exciting range of work. Some of my favorite recent shows include Simen Johan's mythical beasts, Ezra Stoller's architectural photographs of the TWA terminal, and Sze Tsung Leong's huge cityscapes.
The rooftop garden at the Metropolitan Museum of Art. The museum floors below are a maze of tremendous art and inspiration, and taking the elevator to the rooftop garden is the icing on the cake. 360' views of verdant green Central Park bordered by cool glass and steel of Manhattan's cityscape in the distance.