New Year's. My wedding anniversary is New Year's Eve (11 years this year) and (unless dh and I have just been in a fight, which is rare but has happened) it's much more fun than Christmas. There are so many obligations to be fulfilled for Christmas but New Year's is more quiet and relaxed and we can do what we want.
I really prefer Thanksgiving though! It's more of a casual family get-together without the pressure to get perfect gifts for everyone. We can hang out and pretend we enjoy each other's company without getting quite so frazzled.
3a/b, fine, lots of it