The following are ideas I came across, that might interest you. These potential job opportunities are not necessarily science-related. Check them out! (And if you heard about something - feel free to email me about it).

* LA Parks - look up for summer camp supervision, clerical positions, maintenance services in parks and more:

http://www.laparks.org/job.htm

* Summer research institute for students and teachers with CalTech professors:

http://www.src.caltech.edu/