Any Ideas?

Hi=] for the Summer of 2009 i plan on going on a summer exploration trip to japan. im 15 so of course ill be going with a group. trouble is my family dosent have enough money so i have to raise it myself. The cost for the trip is $7,500. that in cludes airfare,stay,food and all. my mom is telling me to babysit. but im not very good with small children. i live on an airforce base. so i was wondering if you guyz had eny good ideas how i can raise the money. im trying to find a job currently but its so hard because im only 15. well eny ideas?