Invest it into Detroit's automobile market...jk lol.
But seriously save up, and spend it on something meaningful (refer to what tinymonkeyt and thebobevil said).
A good way to save up is by opening a bank account, making a deposi, putting more money in over time (get a job for this), and watch it grow.
Looking at the economy (assuming you live in the US), save up your money, and when the worth of the dollar goes up, buy a yacht, or cruiser lol.
WATEVER YOU DO, WARNING:
Dont blow it all off on video games or other useless stuff. Do that when ur older. Tech advances everyday. There's even a new DS, and remodeled Wii, rumored to be released. The tech from last gen, are worthless peices of crap to me today.
Spend your money wisely...