Hi Paul,
Whilst on City Island (the self-proclaimed  "Cape Cod of the Bronx ! "), stop by the Harlem Yacht Club - "The Friendliest Club on City Island".  I was the Commodore back before the turn of the century - mention my name and you'll get a free ice cold glass of water and some "sea stories". Guest moorings are available - tell them you want the deep section out by the channel.
They've also got an excellent restaurant which I think has reopened.
Cheers, Craig