I always enjoy visiting Chinatown. There's always something fun to see. I've been wanting one of these dragon marionettes.
This is our favorite Peking Duck spot in Manhattan. Peking Duck House on 28 Mott Street. They have another branch in Midtown at 236 E. 53rd St. (53rd St. between 2nd & 3rd Aves).
Also on Mott Street: If you like "hopia," the flaky pastries with sweet paste (mung bean, black bean, etc.) they make fresh hopia here. Tasty! And if you want soy milk, fresh tofu, sweet tofu (taho), you can find it across the street.
If you prefer the steamed buns (pork, chicken, sausage, or the "special" sort with all three & salted egg), head over to Century Cafe. : )