Buy/build a moutain bike and ride it/improve my skills on one.
RAB – which I'm in two minds about pros: a nice 'easy' supported entry to multiple day distance cycling/touring. cons: expensive and possibly sharing said journey with people I don't get on with.
Maybe a late summer sportive as well.
Got to get the hassle/expense of moving out of the way in the new year first though. 🙁