Hi there, Sunshine!
The second week in December is fantastic. You have beautiful weather (we are certainly spoiled here in our Florida winters!), holiday decorations, and lower crowd levels. Most schools are still in session, so you won't hit lots of holiday vacationers. This year, Thanksgiving falls very late in November, so you might experience some spillover from Thanksgiving into that first December week.
Bear in mind that some nights at the
Magic Kingdom will be reserved for
Mickey's Very Merry Christmas Party, so you will want to plan your days accordingly, and head to the Magic Kingdom on a non-party day. While dates have not yet been released for the Party, a glance at the
official calendar will provide some information: If the Park closes at 7:00pm. you can be pretty sure that there's a Christmas Party that evening.
Have a wonderful time!
See you later, celebrator,
-Deborah B.