If you're not a story weaver, hug a novelist, or at the very least, read a novel and encourage a love of reading and writing in our next generation.
Check out the NaNoWriMo web site for fun writing prompts for all ages. Those under 18 can still get away with setting a realistic word goal, with the Young Writers Program, and can still win NaNoWriMo without conquering the big, scary 50,000 word beast. Check out their unique kid-friendly web site for fun writing tools like The Dare Machine, which spews silly writing prompts.
So, write on. Read on. And if you see someone in a NaNoWriMo tee shirt frantically tapping away at a coffee house near you, give 'em a smile and buy 'em a cup of joe. They're gonna need it!