Today is very special. A day like this will not come for another 100 years so why not make a resolution to do something daily/weekly/monthly that can accelerate your professional and personal growth. You can always look back on 12-12-12 as the day you kicked off a special habit. My favorite quote from Aristotle "We become what we repeatedly do - Excellence then is not an act but a habit." Here is one idea from me - Set aside 30 mins every day to do something on topics that inspire you - read a blog, a book or watch a thought-provoking video or engage in a nice conversation with someone you respect. This will help you to eventually grow your inspiration into an aspiration. By connecting with peers with similar aspirations, and getting guidance from suitable mentor(s), you can actually realize that aspiration.
What resolution are you going to make? Or what would you recommend for others based on your own experience?