Walk the streets where you live and give $10 to every person you see engaging in a random act of kindness or go get some fast food and pay for the person behind you a few times.
Use it in a way that would not only brighten your day, but brighten someone else's day as well.
You could even take that ten grand and find a local business that you support, and tell them that you're willing to invest X amount of money for X% return.
I would do good things for people though (:
It sounds like you're too young to worry about bills or a family, so it wouldn't hurt you.
If you're nearing the end of high school, screw helping people. Invest that shit hardcore and make bank for your college education.