We went last year for the first time and the best experience of the lot was a helicopter ride round Manhattan. We got the 15 min one - that's loads of time to see everything and although it's pricey enough (can't remember exactly but maybe $70 each?), it had the real wow! factor! Liberty Helicopters was the name of the company, their reps will be selling trips on the street round empire state etc so haggle with them to get the best price. I'll be doing the trip at night next time.
Enjoy your trip you lucky thing!!