Isn't there a port area that could accommodate a pad while being far enough away to not bother any residential areas? Such an area would be as noisy as hell already - I'd be amazed if anyone would notice the helicopter traffic.
Nobody complains about the Mechanics Bay helipad in Auckland do they? My ma-in-law's apartment is not too far away from it with the container terminal in between and you can't hear the helicopters at all.