We are staying at the Yacht Club. First time staying at a deluxe! So excited!!
You are in a perfect position to explore the Epcot resorts. We generally start at the Beach Club and stroll around the Boardwalk. The lobbies have really lovely displays, however the BC is my favorite of all the Epcot resorts. They not only have a display, but the lobby is decorated with themed arrangements and trees. It is fun to listen tot teh holiday music in each resort.
I think that a Christmas trip is different than any other. For us, we make sure we focus on Holiday displays that are not around any other time of year. So....on your Party day, I would plan to visit the Monorail Resorts lobbies. They really have a lot to offer in terms of themed decorations, with the Grand Lobby being the most impressive. I would plan to end there, becuase if you are there at 3 PM, the Grand Pianist will be entertaining, and that is frosting on your cake.
If you can fit a trip to WIlderness Lodge in, that lobby is awesome as well, and if you have dining at Animal Kingdom Lodge I woudl plan a little time to explore that lobby too. It is a favorite of mine.
The best way to approach a party is really about what you want to get out of it. If you want the exclusive party stuff - don't miss the parade, the fireworks, the castle lighting, snow on main street. If characters are your thing - don't miss Sandy Claws, the seven dwarves, and some regulars in Christmas gear. If you're about the rides - most will have short lines because people will be doing other things. It really depends on you.
This! I think that planning your objectives ahead of time is key to ensuring you do not leave the party with buyers remorse. You cannot do it all, so planning wisely makes a huge difference. I would book FP between 4 and 7 if you want to get a few attractions is before the start, and I would eat dinner before the party.
We seldom stand in character lines anymore, but when my DGD was young, it was the priority at parties. That and the parade and Castle show and wishes. Anything else was a bonus. We knew though, that the lines were a time commitment that made the attractions come second. Make sure that you know your priority before you go.
I think that since you planned a Holiday trip part of what you are looking for are the special events. Focus on Epcot and the MK, for the events, and plan time at DS for the Tree Trail and Drone show as well. Im not sure how DHS is playing out with JBJB, but planning an evening there might be worthwhile as well.