Definitely check out Uniqlo. It's a Japanese fashion store in SoHo. Very cheap and usually has a lot of cute stuff. I've been to the Tokyo store, too.
http://www.uniqlo.com/us/stores/ny_soho_store.html
TKTS will have a few good things. Read up on what is on Broadway so you actually know what is offered. The list varies by day so who knows what will be available. When I went, you could get tickets to see Daniel Radcliffe in "How to Succeed."
Look for a walking/eating tour of China Town. We really enjoyed this. Great history lesson plus awesome food. We also have done the West Village but it wasn't as good. That being said, walk around the West Village to shop some.
Oh, and I can't forget...try Momofuku in the East Village on 1st for food. It's AWESOME! You'll have to wait a little, but it's so worth it. Get the pork buns and the Momofuku Ramen. If you like pork, this is pork heaven in a bowl! My husband laughs that every time we are in NYC, I make him take us there. We've even had star sightings there (Kelly and Ryan from The Office.)