Hi,
I'm not a pbh expert but I have stayed there a few times. Just put balcony in your room requests. Don't get your hopes up though. There are very few balconies and most of those are tiny.
The last time dh and I went to PBH I requested a balcony. I got it but it was in the east wing and a palm tree blocked most of my view.

Unless you're going for the "presidential suite" type room they're probably not worth it.