Departmental clubs offer science students a huge variety of services.
The worst mistake you can make during your university career is to not get involved. There are tonnes of clubs, focusing on everything from Astronomy to Bzzr Gardening, so there's bound to be at least one that interests you. Within the Faculty of Science, several clubs exist to cater to your specific needs. Some are goal oriented, such as Pre-Optometry, which attempts to help its members into Optometry colleges, and some are just there for the hell of it. The Astronomy Club is made up of people from different faculties.