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.
Travel Agent/Cruise Specialist w/13 yrs exp and 48 Cruises on 11 cruise lines! Favorites: Paul Gauguin - Tahiti: Uniworld River Cruises - Europe; Celebrity Solstice-class ships; Holland America - 12-nights Baltics & Russia; RCCL - 14-nights Greek Isles, Turkey, & Croatia; Holland America - 14-day Alaskan cruisetour; 10-night Canada/New England cruise; 21 days Hawaii w/7-night NCL cruise; Oceania - 25 days in Asia; more than 3 months touring Europe by train. And many all-inclusive resorts!