We were there Dec. 15 and watched the fireworks from the beach at the Poly. We took a resort launch there and found our way out to the beach directly in front of the castle. My husband and I sat in a swing while the kids rested in the lounge chairs. I can't remember if we could hear the music but the view was quite nice. Get there early and you'll get to see the Electric Water Pageant. Can't say I'd leave dinner early for it, but it was a nice little bonus.
Have fun!!
Tina