Do your research: on the lab, on the faculty, on the department and on the city itself. There are so many different programs/departments and it's imperative you know what you're getting into. Speak to students that are currently in the lab or have recently graduated to get an idea of how things work. There are going to be some tough times in your program and you want to make sure you're surrounded by people that want to support you and help you get through, to be successful.
My advisor was more like my mentor. He is very open, honest and helpful, which made me very comfortable to express my ideas and also to discuss different issues concerning my academic life.
I chose to study at the University of Guelph because I liked the friendly, community-based attitude here. After completing my undergraduate degree at Guelph I knew this is where I wanted to complete my master's.
If you are considering graduate studies, I suggest that you take your research interests and see who on campus is pursuing something that aligns with them. Given the wide range of topics and fields of study here, I would not be surprised to see at least one other individual or faculty member engaged in some research that closely mirrors the interests of the student.
Graduate studies are a great experience. In my experience, it was much more practical learning to equip you with skills to use in work settings. You also get to meet so many people who are in the same field and diversify your network.
Pursue research that you truly believe has the potential to improve life. Knowing you are working toward something more than just a degree can help you find the drive to make it through the difficult or dry aspects of your time in graduate studies.
Your time in graduate studies will provide many opportunities, but don't lose touch with yourself. Take the time to do what you need to in order to maintain your sense of purpose and direction, then live out of that. Don't be afraid to try new things, but remember that no one can do everything. Be selective.
I would tell any prospective grad students to visit the campuses they are applying to, and talk to students in their program(s) of interest! A major factor in my staying at Guelph was the campus community, and knowing that I would be supported throughout my studies in not only my academics, but also through the social atmosphere on campus.