I'd travel the world, trying to leave each place a little better than when I came. For as I've come to learn, its not the destination but the journey that creates us.
Stay intellectually curious, never grow up, take chances, meet everyone possible, and practice productive procrastination. Take time to mess around. Get Lost. Wander. You never know where it might lead.
And if you've made it this far, say hi. People helping people goes a long way.