You can spend $100,000 in an hour but Staten Island ferry round trip (free) is the best way to go weather permitting. Or you can charter your own boat with some wine and food out of Brooklyn, City Island or Port Washington, you wont need a big one. One thing about Manhatten you can go from un-inhabited places you never knew existed to lower Manhatten in 25 minutes
Steer clear of the Circle Line is a rush meat wagan.
The Helicopter is a joke you really cant see anything, they cant fly over land and have to stay under 1500 feet, tiny windows etc.
Been at NBC, SNL we had some 1AM private "partys" at Top Of The Rock (pre 911 and General Electric days) Haa Haa ....I cant post the details
Personally I wouldnt go nuts trying to plan an ethnic wedding...if your going to come to NYC just be like a New Yorker. You cant really plan, its a waste off $$
Just get on the street and do it you dont need a rippoff tourguide ...just ask somebody and hop on the subway 10 minutes to anyplace you need to see. You may even see the Mayor strap hanging (he rides the subway)who can marry you its actually part of his job