Currently on hiatus due to the removal of my appendix - but soon to start back up -
General excercise stuff -
Running, weights, general calisthenic stuff (I love my fitball)
More Running. I try and get out and do a 3 or 4 km run at least once or twice a week.
Forms, forms and more forms.
For a long time I was into doing single application drills, just to work that muscle memory, now I do less, but I go back to it every so often.
Weapon's drills / Coordination drills
Shadow boxing I have found useful, more because of the theroy aspect - I.e. I'll find new stuff, techniques etc off the flow with shadow boxing, which I will then be able to experiment further with a partner.
Stuff like that... realistically, depends on what I feel like doing on the day
'If someone wants to fight you, run a mile. If they are still behind you after that, run another mile. If they still want to fight, and it is really worth it, turn around and beat the living !*$!% out of them, 'cause they will be really tired.'