Pammy, I hope this gets to you before Monday night. You're within striking distance of some great places.
The "new" Aquavit with it's Scandanavian inspired seafood; and the old grand dame of French Cooking in Manhattan "La Grenouille" come to mind. Both may be out of your price range at dinner. But, Le Grenouille has a terrific pre-fixe lunch special during the week.
At dinner, there is an outpost of Les Halles on Park Avenue in the 20s. If yo're willing to head in that direction checking in to see if a reservation is available at the always excellent Union Square, Grammercy Tavern or Craft is worth the effort.
For old school Italian served in formal wear by crusty waiters, Giambelli 50 is nearby on 50th Street not far from your hetel.
Nor are you very far from 21 with its menu of traditonal favorites as well as inventive new dishes.
I concur with the recommendation of Rene Pujol for a pre-theater dinner. It doesn't have star quality. But, the food is always well prepared and well priced there.