Thanks for all the helpful thoughts!!!
I will not take my kids out of school, so our choices really are June, July, or the four weeks they are off for holidays. (One for thanksgiving, two for Christmas, one for Easter)
So if we were to go in December, it'd be after they got out. Or, we could leave that last week when they dont do any work, just have christmas parties, etc. But then we would be coming home right around christmas day.
Being as I can't even book this trip for quite a while, I'll let the ideas flow, then play it by ear about the date.