In my first year at SFU I was a mentee with the BASS Mentorship Program (designed for first year Beedie students); now I'm going into fourth year and have been a mentor myself for three years.
Watching students start out as mentees and then give back by eventually becoming mentors always stood out for me. Being a first year in a university can be very challenging, and having mature peers to give guidance on things like choosing classes, professors, etc can be so helpful.
As a mentor, I was able to build a network of people within the Beedie School of Business who may be able to help me after university.