I'm seriously considering doing some more study. The University of the Third Age (u3a) offers online courses, for over 50s, to do at your own pace. There are no degrees awarded or anything like that - it's purely for interest's sake. There are a couple of courses there that look interesting - Intro to Western Philosophy, Renaissance Italy, The Romans, Creative Writing (hahaha).
Since I quit teaching I think I'm missing the intellectual challenge.
I'm really only tossing up between the first two courses - I know a fair bit about the Romans already and I really think that creative writing (creative anything) is beyond me.