One Thursday a friend invited me to The Brooklyn Art Library, which has nothing to do with the Public Library. It is a completely creative experience. They have over 40,000 sketchbooks on their shelves and 20,000 in their digital library.
The day we were there, they were preparing for a wedding, which was unique because it was a Thursday afternoon....not even after work...smart couple, to save lots of money.
The staff were great and they answered many questions. It was a great place to get inspiration and also leave a little of your own.