FreeWalkers are not the only odd ones walking in unusual places as this New York Times article suggests. 

There's an annual 13-mile walk in New York City from Union Square to JFK Airport headed by Andy Maskin, a Gramercy Park resident started on a gratingly beautiful day in 2004. He was inside; he wanted to be outside.

“I was looking at a map and said, ‘What’s an arbitrary landmark to walk to?’ ” he recalled. “I looked at the expanse of the city between Manhattan and J.F.K. and thought, ‘There’s so much of that I’ve never been to.’ I grew up in the city, and I had no idea what it was like to walk around in these neighborhoods.” So, the tradition continues...

Full article NY Times - 9/15/12 - MATT FLEGENHEIMER