We just got back in from dinner near the Fulton Ferry Landing in Brooklyn and there was a group of people taking formal portraits with the Manhattan skyline behind them. There was a girl in white, a guy in a tux, some kids all dressed up and a group of girls in matching purple dresses. From the looks of it you automatically thought wedding but this was actually a sweet 16 group.
This location is very popular with bridal parties and on a Saturday and Sunday you can expect to see one posing for pictures at any time of day.
If you and your groom want to take portraits or some candids at a location other than your wedding ceremony or reception venue make sure that your photographer is aware of this and that you make time in your wedding day timeline to get to and from the shoot location and have time to take all the photos you want there. Give your photographer a list of what you want and make sure that someone in the bridal party or your wedding planner's assistant is checking off each one so you don't forget a must-have shot.
It's important to make sure this information is in your vendor contract with your wedding photographer because you don't want to incur overtime charges or at least you want to know if there's an extra fee associated with this off-site shoot.