If you go to the Bronx Zoo, you may want to check out also The Botanical Gardens almost across the street, but impossible to do both in one day.
I forgot to send you to The City Quilter. Is a little expensive, but not as bad as you would expect from a store in NY with an amazing collection of NY fabrics so you can make a memory quilt of your trip. Also while in Times square you are close to the Fashion District, along 7th avenue and all the cross street. To die for. Stores after stores packed with all sort of fabrics, decorations and embelishments.
You can also get an extra suitcase very cheap. You may need it.