During Orientation week, you can join tours of the campuses and faculties, so at least you'll be able to make your way to your first lecture. It's also important to know where to find the libraries, cafeterias and student services. The most important thing to remember is that Orientation week is FUN because it's run for new students and offers the perfect start to student life. Current students organise a series of events to help you adapt to your new environment. Clubs and Societies will be busy informing you about what they have to offer, and various faculty-based activities will also take place.
Many faculties offer students the chance to sign up for a 'host scheme'.
These are a more formal way of meeting people in your course, but they're lots of fun. So if you get the opportunity to join one, go for it. Familiarity with the university's information technology environment has become increasingly important in recent years. Many subjects have their details on websites where additional material such as practice exercises and problem solutions are made available to students. Introductory sessions run during Orientation week and it is a good idea to take advantage of this opportunity to familiarise yourself with the computer labs, get your own email account and learn how to navigate the system.