Crowds gather all day to cheer on runners, blast boomboxes, play drums and hold signs. It's a great way to mingle with neighbors and feel the amazing energy that the marathon brings with it.
Plus, it's cool to see the runners' reactions, especially those from out of town and from other countries.
One of the very first days I came to Clinton Hill to apartment hunt, I walked up out of the G train and right onto the marathon route. It was a gorgeous fall day in 2003, and I knew I had found home. (Sorry for the cheesy tidbit.)