-Check out the dam release schedule at NPMB and post up to see if anyone else is hitting up any of the runs.
-Also- If you are up to it - put up a post asking for folks to hit up the Popolopen. Class V creeking, supposedly very (30-45 minutes) close to NYC. Even if it's not in season you'll probably dredge up some NYC boaters who will probably chime in.
-One other note - there EC boating scene is way more interconnected because of the dam-release nature of the boating there (not much running, everyone congregates at the same runs). If you're willing to do a bit of driving along with your message board activity you're likely to hook up with folks in your hood via old fashioned social networking.
Let us know how it goes!