Sure, get coffee too! You should have no problems getting in there with out PS too (as long as it isn't the most busy time of year, and even then you might be fine.)
I love wacthing the fireworks and water electrical parade from the beach at Poly. It is one of my favorite things to do. Very good with little kids. They can play while you wait and it is close enough to see, but not loud.
Also very romantic for couples! Grab a hammack if you can.