How do i make money this summer?

I'm twelve and i'm trying to get money for a trip to hershey park and i need help trying to get some money. My mom already said i'm not allowed to sell any thing so that's out and I don't know what else to do. I'm not old enough to get an actual job yet and I don't have money for lawn equipment. My parents wont help and my older brothers wont either i have until august 25th HELP!!