We decided to visit the Empire State building by night and the top of the Rock by day. In retrospect, we might have done it also the other way around to get the Empire State in a night shot.
We visited the top of the Rock observation Deck with our NY Pass. It meant free entry and no queue for us. So if you have NY pass; flash it and skip the queue. This does not work in Empire State.
You have 3 observation decks. My advice go right up to the top one. You get the best views, can take the best pictures and lots of people don't figure out you get 3 decks, so you have not many people lingering around. We skipped the Rockefeller exhibit due to a lack of time, but not sure you will miss a lot. You came for the view right?
Enjoy the great View of Central Park. In my opinion Top of The Rock was the best place to take it in from above.
Also the view on Empire State and World Trade one is amazing. Just watch the pics.
Afterwards we strolled through the rockefeller center and visited various shops and the NBC gift shop. Must do for any fans of NBC shows like Friends.