Some of the backs are only accessible if you are a student attending the college or have paid for a visitors pass but there are paths to follow which take you around the backs and back into the city centre.
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However, one does not simply walk along the backs. The land is privately owned by each of the colleges and there is no tow-path along the route of the river. The closest you can get, on foot at least, is by walking along the Queens' road.
If you are thinking of applying to Trinity, either as an undergraduate or postgraduate student, you are welcome to look around at any time, free of charge.
A day out at the colleges can be an affordable way to get to know the city as although some charge a small fee, most allow visitors to enter for free. The Colleges offer limited hours during exams and are sometimes closed for a concert or other event, so make sure you check the website before you head for a tour.
So what is the best way to see the backs I hear you ask? Well, unless you happen to be a member of one of the colleges, Cambridge University, with free access to the colleges, or you can fly, then really, your best option is by punting along the river.