Tikiman's website is the best on the internet for information about the Polynesian, he hasn't missed an inch of the resort. Tons of photo's, great information, and he goes longhouse by longhouse in great detail.
There are some great pictures on Deb's site as well, here is the link to the Polynesian page of her site...
http://allearsnet.com/acc/g_poly.htm
You made a great choice with the Polynesian, your family is going have have a wonderful trip!