Hi, Mary Ellen! I just love Mickey's Very Merry Christmas Party! It is one of my favorite holiday traditions in my family. The "official" entry time is 7:00 p.m. for this event. That said, depending on crowds and the fact you have a dining reservation, no guarantees can be made but you might just be OK getting in early. ;)
Buses headed for all Disney Resorts are available just outside the gates of the Magic Kingdom. Buses to theme parks can be found at the Transportation and Ticket Center. Click
HERE for more information on transportation.
And finally, you lucky family, staying at the beautiful Polynesian Resort! Your question cut off, but I see you requested Tokelau. While I have never stayed in this building, it is centrally located. In this building, you are near the "quiet" pool. This is a nice location to walk to the TTC where you can hop the monorail to Epcot. For catching the monorail to Magic Kingdom or buses to Animal Kingdom or Hollywood Studios, you can use transportation right at your resort. If you had other questions about your building or the resort, let me know!
Wishing you and your family a wonderful vacation in Walt Disney World. I hope you enjoy all the festive holiday decorations. Enjoy and
Let the Memories Begin!