That would be awesome. I would like to guarantee you'll have fun, but all I can really guarantee is that you won't be bothered by what others think of what you want to write. (the anchor my UT NaNo friend apparently can't cast off)
This year I thought ahead like crazy for the main NaNo, and it either wasn't enough, or it was too much. I floundered, went with whimsy, and then fell into a corner because I stopped enjoying it and no longer cared about even getting to the end. I think it might well be best to have no idea at all, for me.
It's all relative, though. Some outline like crazy and write a 264K novel in 27 days, others just pants it and get done at 75K in a week. Or less and less of either/each.