How can I maximize internship opportunities in college?

The best way to maximize your opportunities in getting involved with internships and other career exposure opportunities is to follow the processes described in my answer to your other question. The key to developing intern and mentorship opportunities is developing and maintaining helpful interpersonal networking relationships with people who are involved in your career area - after you have arrived at a point that you have done the work to make sure that you are making a relevant decision based upon how your personality traits relate to people involved in your area of interest in mental health.

Also you can do a lot to seek out your own opportunities. Here is an internship story which I would like to share with you.

<span style="color: black;">During my daughter's senior year in high school, the highlight of the year (and of the whole high school experience) was to be a several month long internship program. Everyone signed up and indicated the type of internship that they wanted - all except for one girl. This girl wanted to become a doctor and wanted her internship to be with the local EMS unit at the local fire station. So, she talked to the head of the EMS unit and got his approval and made arrangements with the school to create her own internship. Of all of the students about which I heard, she was the one who benefited the most by her internships. My daughter's was definitely not the highlight of her school career. Her first choice fell through and her final assignment was not really what she wanted and did not give her the type of exposure that she had hoped for. </span>

<span style="color: black;">This shows that you can create your own internship! Locate a company that fits the parameters of the type of experience and exposure that you are seeking and work with them and the appropriate people in your school to put it in motion. After all, if there is an internship program existing today, anywhere, it had to be created by someone.</span>