The past couple of years we have gone the week AFTER Thanksgiving....mid-week. (Like Tues-Thurs). The most recent trip we added Mon. as a 4th day. It is a GREAT week to go. The park has only been open from 10am-8pm, but shorter operating hours are a good indication that attendance isn't high. We have had short lines for almost everything. The Christmas decorations are beautiful, and since they are showing the Christmas fireworks show at that time, they are shown everynight (as opposed to just the weekends). We have had a couple of fireworks shows cancelled due to winds, and it has rained on the day we left for the past few years. But we have always had great weather and love going that week.
This year the week after Thanksgiving falls in December for the first time since we have been going. Hopefully that won't make it more crowded. From what I understand, the Cast Member parties might be the first Mon and Tues in December........which means they close DL early (like 6pm?) and keep DCA open later. Fine by us........we would love to be in DCA later into the evening. I love being there when it is all lit up. Good luck planning!