Besides the obvious and hanging with family/friends the night before, I always make a point to sit down for a good hour or so and write down a list of things I realistically want to accomplish. It's a great motivator, even if it's a bit of a cheesy method. Last year, I wanted to do 30 completed art pieces for the entire year, get back to semi-decent fluency in French, and finish Clair De Lune on the piano. Realistic goals and I finished them and still feel motivated to create more new ones for this year! When it comes to writing and RP's, I also set a separate list of things I (hopefully) want to accomplish in them throughout the year, though it's a bit more tricky to actually follow through with RP plans because so many times they either fall through or something unexpected happens, but still, I like to write the goals!
That's usually how my New Years Eve goes! No parties for me except getting drunk off of chocolate milk >.<