I will be staying at the Dolphin Resort for part of my December trip this year.
I am not sure if the very large 45 foot tall Christmas tree is still being used in the center of the lobby, but I loved the larger train rolling around the bottom of the tree skirt and all of the poinsetta flowers and just the general atmosphere of the lobby during the holidays.
In past years, there were a few Dolphin Resort's Lobby December events that were planned, but I don't know if they will doing the same thing this year.
Twilight Magic:
Each night at 6:00pm, there's the "Twilight Magic" tree lighting ceremony in the Dolphin lobby.
Santa's Workshop:
In Santa's Workshop, children are invited to create a fun arts & crafts project. The workshop opens on select days from 6:00 to 7:00pm in the Dolphin lobby.
Photos with Santa:
Santa will be visiting the Dolphin Lobby to see all the children on vacation. Photos With Santa will take place every Sunday, Monday, Wednesday and Friday through December 23. Santa will be there from 6:00 pm 7:00 pm. Digital pictures will be available for purchase for $5.00 or you can take your own photo.
Holiday Performers:
On select nights, the Walt Disney World Dolphin Resort will have local performers and choirs providing special holiday entertainment in the Dolphin Lobby. Performances begin at 6:00 pm.
Cookie Decorating:
Every Tuesday and Thursday in December, children are invited to cookie decorating from 6:00 pm - 7:00 pm. Located by the Dolphin Lobby near the holiday tree.
Campfire on the Beach:
Join us every Saturday on the beach to warm up to our campfire and make S'mores. S'mores kits will be sold for $5.00 each and contain six S'mores. This activity begins at 6:00pm
As others have mentioned, the big three resorts with large interior lobbies have huge 45 foot christmas trees in their open lobby decorated differently in their on themes.
Some people like to plan tours of these resorts to see all of the Christmas decorations.
I like to specifically like to see them at night to see all of the christmas lights on, too.
Some resorts used to keep a weekly list of activities at their resort front desk or guest services to see who my be entertaining in the lobby.
Like at the Grand Floridian Resort with the piano player in the lobby near the christmas tree. Or the small orchestra on the next floor of the lobby near the tear room. Or the various chorus groups from churches or high schools. Or bell ringers or story tellers.
At Wilderness Lodge, but to a lesser extend, they do the same thing, but one year one small animal was brought into the lobby via an AK castmember to discuss the animals.