I had my prom at the Waldorf...It's so pretty-although I've never seen a room! LOL
Anyways:
You MUST go to:
Times Square-especially the Toys R Us
Empire State Building
For shopping: 5th Avenue, definatly!
There are a LOT of good museums around Central Park. The Met, Natural History, etc...
Food:
I ussually just hit a Sbarros or McDonalds...haha
But if you've never been to a Hard Rock or Planet Hollywood-they're fun. There's a place downtown called the Rodeo Bar that has really great food, and on the other side of the restaurant is a bar where they have live jazz and country-ish music every night. It's pretty small, but its fun.
I can suggest a LOT more, these are just some of my favorites-PM me if you want more and/or detailed info as far as addresses and whatnot.
Just keep in mind that NYC is now SMOKE-FREE indoors!!! YAY! haha, so no matter where you go for food/recreation, you don't have to worry about the DD being overcome by smoke, which is nice.