No disrespect to the previous poster, but I think if you want to stroll on the beach you certainly can, or use a hammock (I doubt they are all taken) to see some fireworks you can. Last year we stayed at POR and ate at O'Hanas. Afterwards we just looked around and walked on the beach - it was so beautiful that that is why we booked there next month!
After eating, go downstairs and walk straight out towards the pool. You'll be able to see the top of the castle (if I'm remembering correctly) and that's where you'll see the fireworks.
Have fun!
Melissa
PS: Oh, and if the tag fairy is lurking around, this is for you: (You can't see me right now, but as I sit in front of the computer, I am genuflecting and repeating the words, I Love The Tag Fairy. Just in case you were wondering...)