One thing we learned from being on the Allure is that the Central Park balcony cabins are definitely much more quiet than the Boardwalk balcony cabins.
The CP area has all the trees and bushes to absorb the noise, plus there's just less traffic and less activity. Whereas the Boardwalk area does not have anything to absorb the noise and has alot more activity. While some of these cabins afford a nice view of the Aqua Theater, I much prefer the CP area for the quiet.
Just keep in mind that you're always on display with any of these balcony cabins, so you don't have alot of privacy. And you definitely have to keep the curtains closed, especially at night.
46 Cruises & Counting! Favorites: Paul Gauguin to Tahiti: Uniworld River Cruises in Europe; any of the Celebrity Solstice-class ships; Holland America for 12-nights in the Baltics & Russia; RCCL for 14-night Greek Isles, Turkey, & Croatia; Holland America for 14-day Alaska cruisetour; 10-night Canada/New England cruise; 21 days in Hawaii including a 7-night NCL cruise; Oceania for 25 days in Asia; & 3 months touring Europe by train. And many days spent in all-inclusive resorts!