Pursue research that you are passionate about and that inspires you. Graduate studies are a lot of work and can be difficult, and if you're not passionate about your research then you probably won't enjoy it. That being said, don't be afraid to step out of your comfort zone and experience new things, whether that be academically or personally. Also, don't be afraid to get involved, some of my greatest experiences at the University of Guelph have been outside of the classroom.
TAKE initiative. REACH out. LEAD boldly. This program affords you opportunities and connections that you will not receive anywhere else and if you take advantage of these you will become “that” person. “That” person who helped you, “that” person who was proud of you, and “that” person who you wanted to be.
Although I think most prospective grad students have been told about the importance of picking a study/project that interests you, I think it's also really important to take some time to see how you interact with your supervisor and lab. These will be the people you work the closest with for the next several years, and help provide support to you in some of your toughest moments.
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.
Being a graduate student was a great experience! UofG supports its students in making the program accessible to people of all capacities. I found myself engaging with people from different countries, stages of life, and experience. I really loved the different perspectives that was brought to my classes each week since the people in my program came from all walks of life.