Since you're graduating with Bio and Psychology, go to those department websites, look at the list of professors, find labs that are doing semi-interesting stuff, and ask around if they are looking for a student worker to take on for the summer. You'll have even better luck if you ask professors who already know you from previous classes (assuming you did well in their class).

If they don't have money to directly pay you some sort of student hourly wage, there's a good chance there are some easy grants/free money (in the range of $1-4k) that you can apply for from the school/department. You won't make CRAZY money, but you will probably HAVE FUN, be intellectually stimulated, and add to your resume. Also, instead of posting "FML MY JOB SUCKS" on facebook every day, maybe you will be able to say I LEARNED HOW TO GIVE HEROIN TO RATS TODAY

edit: although a hospital job looks good too for a Public Health candidate

I'm doing work for one of my professors this summer, but the problem is I don't know how long the project will go and if I'd be able to get onto another project for the fall, (and I kind of want to have outside the lab experience for a bit as well) but yeah, I should look into that more.  My school isn't the biggest, but I can always try and hit up Notre Dame or some other nearby university.