Call the Chamber of Commerce...Vacation and Visitors Bureau...
Go to the top of the Chrystler Bldng and to the Top of the Empire State Bldng in mid town Manhattan...
Take one of the many ferry boats on either side of Manhattan...
They have docks on the Brooklyn/Queens side and the NJ side of Manhattan...
The Borough of Queens is pretty good too...
Check the local City/or individual Borough maps for small park walkways in Queens, on either side of the 59th Street Bridge...
There is a Citi Bank Corporate building just off the 59th Street Bridge in Queens...Possibly there is an observation deck or restaurant on top of the very tall bldng...call there...
Call the Chamber of Commerce...Vacation and Visitors Bureau...
Lastly, Someone living right on the periphery streets bordering the East River would know where to shoot from in Brooklyn or Queens...