Did you eagerly wait for your favorite Christmas shows to come on (back when there weren't dvds and a gazillion tv channels)? I'm guilty of planning around A Charlie Brown Christmas. I realize it isn't necessarily healthy for evenings to revolve around the television, but for me these shows are a big part of the excitement and preparations. And just so you don't miss them this year, here is a link to the 25 Days of Christmas and countdown schedule on abcfamily.
Also, a friend and I were discussing the difficulties of hiding presents in the trunk when you drive a minivan or suv, or other trunkless vehicle. While I do most of my shopping online, a few years ago I bought a medium sized colored Sterilite bin for hiding my top secret purchases in the trunk area. Just wanted to share that in case you were having a similar issue. Perhaps your kids are nosy enough to pry off the top, but I don't think my kids even realize there's a box back there.