Can you suggest a fairly inexpensive and physically undemanding hobby?

I’ll be getting surgery soon and have a lot of bedrest ahead of me. I’m a little worried about going crazy! I’m looking for ideas on how to spend my time when I’m not physically able to go anywhere.

I’m very much into crafting and would be open to suggestions on new crafts I could pick up. For instance, I’m trying to learn to crochet (although I’ve tried and failed several times before!). Also open to suggestions for fun, cheapish software I could play around with, and I have a Nintendo DS, so game recommendations on that would be useful too. Also taking recommendations on books that don’t require enormous amounts of concentration to get through (I imagine my attention span may not be at its height while I recover!). I’d be especially interested in those recommendations that are portable, as I have way too much hospitalization in my future.

Thanks!