We had a BLAST at the Polynesian!
Don't miss the pool.... it is very nice, and we loved the zero entry feature. Also, get a cocktail and relax on the beach while watching the fireworks at night. You can get the cocktail from Tambu Lounge, just tell it is to go, and they will put it in a disposible cup for you. Relax in the hammock on the beach one morning. Eat at both 'Ohana (for dinner) and Kona (any meal there is good, but the Tonga Toast in the morning is fantastic!). Enjoy shopping... the Polynesian themed souveniers are really nice. I got some really nice lanterns there. Take the boat launch to the Magic Kingdom or back. Relax at night at the quiet pool, you will likely have it to yourself. Explore the grounds, the flora is beautiful. Rent a surrey bike and ride if you don't want to walk. Rent water craft and go out on the Seven Seas Lagoon. Go to the Spirit of Aloha luau. Try to get a room with a balcony---they are usually only available on the 3rd floor ... we were in Rapatonga on the 3rd floor overlooking the quiet pool. I believe we were in room 2313... order room service and enjoy the privacy and view.
As you can tell we were very pleased with everything at the Polynesian, and spent much more time at the resort than we usually do.