Only members of Disney resorts qualify for extra magic hours - so that includes you at the Polynesian. When you check in, get a times guide from the front desk. Check out which parks have morning extra magic hours, when the park will open an hour early, and which parks have evening hours where the park will be open 3 hours longer. Not all attractions will be open during EMH's, so plan out what you want to do during them to maximize your advantage. And as everyone has said - be prepared to show your Key to the World card before you go on any attraction during EMH's.