1. Become awesome at Excel.
2. Learn how to code.
3. Make a dynamic website.
4. Learn to make a mobile game.
If you're not interested in coding anything other than fun game apps, you could try this course from the University of Reading. It promises to teach you how to build a game in Java, even if you don't have programming experience! If you want to make a truly great game, you might want to read/listen up on Game Theory first.
5. Start reading faster.
6. Learn a language!
7. Pickle your own vegetables.
8. Improve your public speaking skills.
9. Get a basic handle of statistics.
10. Understand basic psychology.
11. Make your own music.
12. Learn to negotiate.
13. Stop hating math.
14. Start drawing!
15. Make your own animated GIF.
16. Appreciate jazz.
17. Write well.
18. Get better at using Photoshop.
Another invaluable skill that will get you places in your career, learning Photoshop can be as fun as watching the hilarious videos on You Suck At Photoshop or as serious as this extensive Udemy training course (focused on photo retouching).
19. Take decent pictures.
Lifehacker's basics of photography might be a good place to start. Learn how your camera works, the basic of composition, and editing images in post-production. If you finish that and you're not sure what to do next, here's a short course on displaying and sharing your digital photographs.