While I was in NYC last week on business, I brought a simple pen and ink set. I draw using a fountain pen with Roting-Brown ink, and a watercolor brush with water to create the wash. I like to sketch people (for some reason, landscape less so). Parks are a good spot. People tend to sit a while, or even sleep, as one of my sketches show. There was also a parade that Monday (Columbus Day), so I was able to capture the crowd.
This woman was reading outside a restaurant, waiting for a table:
This guy fell asleep on a bench in Central Park:
Columbus Day Parade crowd:
Central Park trees: