A few ideas:
1. I enjoy puzzles. Now when a friend first suggested doing puzzles I just laughed because I did not consider my self a 'puzzle person' (and dare I say it I thought they were only for kids and old people, rude I know

). But in the end my friend just delivered me a puzzle and kept asking me how it was going so I started it for peace.
I found it surprisingly satisfying. It used up time and the achievement of making progress gave me a good feeling.
They can be picked up or put down at any time and cause no 'must do' pressure. I enjoy the challenge of WASGIJs
2. Another thing I found good to pass the time was downloading audio programs to listen to on my MP3 player (I use Juice to subscribe and automatically download the programs so all I have to do manually is transfer them to my player).
3. I'm trying to teach myself to write.
4. Going for walks now I am strong enough is a real treat
I suggest brainstorming your real passions in life and then some pass-times might pop up from there.
How about writing a blog on something you are passionate about?