I love languages personally and always love learning more about those I know...
You can always learn some computer stuff like advanced handling of MS Word, Excel, Power Point (creating things really pretty, not just basic primary school like ones - always usable for work). Also basic computer graphics stuff. I've really enjoyed learning basics of video editing for example, just putting clips together so that they don't look like crap when I'm done.
Also you could get into some team sport because it's always good for socializing and getting to know a close knit group of people