For figures, you have Sentinel Miniatures in Valhalla, north of the city.
Clubs:
Blue Point (This may be a bit far, check a map.)
Long Island Auto Replica Society - L.I.A.R.S.
3rd Thursday of the Month, 7:00pm,
The Henrietta Acampora Recreation Center,
39 Montauk Highway, Blue Point, NY
Brooklyn
IPMS/Brooklyn Plastic Modelers
3rd Friday of the Month, 6:30pm
Ryan Ctr,Floyd Bennett Field
BROOKLYN
Levittown
IPMS/Long Island Scale Modelers
4th Tuesday of the Month, 7:30pm,
Levittown Public Library
Poughkeepsie
IPMS/Mid Hudson Valley Historical Miniatures Guild
1st Thursday of the Month,Various members homes
There's also the Long Island figure club who do a major event the tird Saturday of November in Freeport.