Please give us an idea of your price point, cuisine preferences, neighborhood, favorite restaurants, etc.
My own favorite solo dining places are the bar areas of:
Babbo (arrive early)
Modern Bar Room
Blue Ribbon Brasserie, Torrisi Italian Specialties, Momofuku Ssam Bar, and The Breslin are also fun, but you may have to wait a bit.
170 Thompson Street, New York, NY 10012
9 Jones Street, New York, NY 10014
110 Waverly Pl, New York, NY 10011
52 Irving Place, New York, NY 10003
240 Central Park South, New York, NY 10019
15 W 56th St, New York, NY 10019