Where are you staying? That, IMHO, will be a big factor in making suggestions on what to see, where to visit, etc. to avoid crowds and a ton of traffic. One of our favorite things to do at the holidays is to visit Ft. W, go canoeing, visit the stables, see HDDR and book a carriage ride to see the Fort decorations. The Fort is beautiful and we love the holiday additions to HDDR. It's a great way to get into the holiday spirit without being jam packed in the parks. We have been lucky with great weather when we have traveled during Christmas, so we spent a lot of time at the pool. Visiting the resorts to see the decorations and getting some holiday snacks is fun as well. Other ideas - rent a pontoon boat, go to Trader Sam's at Poly (get in line around 1 pm or so to get your name on the list), play a round of mini golf. Lots of non-park things to do to get out of the crowds when needed. We also did Wild Africa Trek that week which was a great way to visit AK away from the crowds.