When we go in December it is usually with a large group of family... myself, DH, dds (16&14) and ds24, dd27, ds-i-l & kidlets (6,4,2,1)
OR DSis&bro-in-law & their kids and grandkids.
The "rule" that we sort of live by is that each family is on their
own vacation, all at the same place and it just happens to be the same time. Too many plans sometimes means too much stress. We usually have just an outline of what we want to accomplish ... all start off going to the same park in the morning and sometimes end up at the same park in the evening. This way, we do manage to trip over each other throughout the day and even manage to do some attractions together.
We *try* to schedule at least one sit-down meal together and always do a character breakfast - if not seated all together then at least in the same restaurant at the same time. We always do
MVMCP together as well as the Osborne Lights. We also try to do the nighttime shows together - SpectroMagic, Wishes, Fantasmic and most certainly, Illuminations!
{This year we are going with both above groups of family - as well as 2 of my sisters & their kids (4,14,17) and dd27's in-laws (mil,fil, sil &dh, & kids). YIKES!

}
No matter what size group we end up with, we always have a great time.