@glitterbiscuits, we really left him to get on with it, but one thing I would definitely advise is have a look at the social activities / societies and find things to join in with. Even if he doesn't carry on with everything, give a few things a go. I was intrigued to hear that DS1 had taken up mountaineering in his first term. It turned out that Rock Soc was the musical variety. However, he did join in a trip to a climbing wall at one point (in Walsall, I think).
One thing he took part in a couple of times was Lost - they got taken off somewhere in a coach, blindfolded, I think, and had to make their way back to the university without spending money, completing various tasks in the process. The first year, he got one eyebrow shaved, although I'm still not sure whether this was intentional or accidental
.