I did Nano for 5 years... the last 2 years I had great success by going in with a scene list laid out like this, which is how I still write:
Scene # (1-60, 20 for each act, the rough length of a novel, this gets shortened to about 50 chapters during editing, I find... some scenes merge)
Characters present in the scene (I do these last, I know a lot of people don't)
Major event that should occur to move the story forward
Any Revelations that should occur to move the story forward
With a list of 60 scenes, you can take a stab at 2 scenes per day during Nano, each scene having a goal of 834 or more words. This is perfect bc if you get hung on one scene you can skip to the next without slowing. And you still know what was supposed to have been in the skipped scene from the plan you made. It was pretty easy to win going this route, I found.
Best of luck to everyone!