One of my teachers in college (Law & Security, now called Police Foundations in many places) who is now a Superintendant at my Department gave me some good pointers. As a generality, you must find a way to stand out.
Second language? Everyone has French, and how often are you going to come across a monolingual Francophone outside of Quebec and it's adjacent provinces? New languages are hard, but if you were taking Farsi, it doesn't mean you could translate a Koran, just working on something that most people don't have. Sign language is also a good one to pick up, and being able to hold a basic conversation and learning the alphabet takes about 10 weeks.
With respect to volunteer work, try to do something that isn't fun. Example, lots of guys like to volunteer to coach little league baseball and hockey. That is great and commendable, but you and several hundred other guys also have it on their resume. STAND OUT. Go to your local hospital and look into helping in the palliative ward. You will get a health dose of humble while you feed mushy food to immobilized senior citizens in varying staged of death and decay. You will go home every time feeling like you have a layer of cement on your shoulders. However, that is like a strobe light on a resume that says "I give a crap about my community!".
If you pile on too much cop-ish stuff, you may look over eager ie) works as a security guard, aux police, volunteer security for community events, volunteer for victim services. All good things, but you don't want to look like you are a fixated wanna be. Try to show a profile of life experience too. Move out, pay your own bills and car insurance, etc. If you are living at home and are a full time student until you are 29, how can you go into the community and be able to relate to people?
I am not a recruiter, so I can't guarantee what the magic bullet is. I just know what worked for me. Good luck!
