I have just returned from visiting my sister who lives in New York just a few blocks from Central Park. I did 2 runs while there, this one was twice around the Jackie Onassis reservoir, the whole run (including to and from my sisters apartment) was about 7km. It was a truly beautiful morning and this sunrise was stunning. I felt a bit 'touristy' taking photos, but quite a few people stopped to take a pic. On the second run a couple of days later the weather was somewhat different - lashing rain and a gusty cold wind, but very refreshing nevertheless. On Sunday we went for quite a long walk around the north part of the park - so many runners! I don't think I have seen so many people out running for fun in one place.
I am going to look up some organised runs in Central Park / NY for when I go next. Does anyone know of some shorter ones (10k ish) that they recommend?