How can I make money?

I am a 13 year old girl and I need to raise money. I am going to Paris in April with the Air Cadets but I need to raise 2,900$ and we definately do not have the money for that right now. So I can't go unless we have the money so I am looking forward to finding a job this summer. My last day of school was yesterday so I wanted to look for some jobs. Since I am only 13, I can't get a real job so I was just asking what are some good paying jobs I can do over the summer. Thanks for your answer ;)