Hi Debbie!
Thank you for the compliment and for sending your question to me. The easiest way to get from Epcot to the Boardwalk is to go out Epcot's International Gateway entrance which is between the United Kingdom and France in World Showcase. After exiting, you can walk or take a boat to the Boardwalk. Depending on how fast you walk, it's about a 15 to 20 minute walk to the middle of the Boardwalk. At the Boardwalk, you will find restaurants, shops, a few carnival type games, two nightclubs, and, of course, Disney's Boardwalk Inn and Villas. If possible, and if everybody in your party is at least 21 years old, be sure to stop in at
Jellyrolls, which is a dueling piano bar. It's fabulous.
When it is time to leave the Boardwalk and return to the Polynesian, I suggest taking a Disney Bus to either the Magic Kingdom, if it is still open, or Downtown Disney. The Magic Kingdom would be the best choice, because once there you could ride the resort monorail to the Polynesian. If you go to Downtown Disney, you would have to transfer to a bus going to the Polynesian.
Of course, if Epcot is still open, you could return to Epcot, walk to Future World, go out the main gate of Epcot, ride the monorail to the Transportation and Ticket Center (TT&C), and finally switch to a resort monorail going to the Polynesian (or just walk from the TT&C). However, I think this longer than going to the Magic Kingdom or Downtown Disney, and then to the Polynesian. Finally, the quickest way, but at a cost, is to take a taxi from the Boardwalk to the Polynesian. I have found taxis to be quick and relatively inexpensive on Walt Disney World property.
Please write back if you have any more questions!