I'll be visiting Manhattan this March.  Though I'll be there mainly to meet new friends, I'm thinking of tacking a couple of days onto my stay just to enjoy the city.  Though I'm a native New Yorker, I don't get home as often as I'd like, and as a result I'm completely out of the loop about what's new and exciting this spring.  
 
Anything I should make sure not to miss while I'm in town?  I love all things gastronomical, live music and theater, and am always looking for an excuse to try new things.  Shows, festivals, new restaurants-- What should be on my itinerary?