I always advise visitors to NYC to take in the Forbes Museum, at Fifth & Twelfth. It's [b]free[/i] and has the largest collection of Faberge Eggs available anywhere - plus lots of other toys & collections.
Strawberry Fields is a tribute to John Lennon in Central Park, near the Dakota Building where he lived & died. It's at 72nd & Central Park West.
And leave some time to shop. You'll just hate yourself if you don't bring back something from one cute little shop or another!