The only time you sample university life is at lectures or if you participate in an activity on the university level. However, it is not that difficult to meet people from other colleges. The range of subjects is traditional and relatively narrow although there is a considerable amount of variety within them. Don't apply if you want to do media studies or sport science or something else which is quite vocational. Lectures are given on a university level.
Attendance is optional.
The main source of learning is supervisions. Don't play down the amount of work. Again, it is very easy to get involved in any activity you do already or may fancy trying. Loads of pubs. Some colleges have their own cinemas, also one in the Grafton centre.