Ours are 6 and 3 right now so missing school is no big deal...I'm trying to take advantage of that while we still can...I figure maybe another year or 2. Once the oldest is in third or 4th grade I think we might need to be a little more cautious of missing days during the week.Mid January is awesome, usually with minimal crowds. If I did not have to deal with kid's school schedules I would always go in mid January. No (or at least only short) lines and comfortable weather. The week after xmass/NYE was also been a good one for us in the past.