Aloha Loretta,
What fun you must be having planning your first WDW trip with your grandchildren!!! And at the Polyesian, one of my favorite resorts, too.
To help with itinerary planning, I think www.touringplans.com is an amazing website. It is from the fine folks behind the
Unofficial Guide to Walt Disney World guide book, and it offers over 100 researched itineraries as well as customized ones to help you make the most of your trip. While it does have a nominal fee, I think it is a worthy investment.
If you'd prefer to go another route with your planning, please let us know.
PS I'm including a link to an answer I wrote about my favorite building at the Polynesian in case you are curious -- just click
here.