Sewing
I have gotten into sewing lately and have been working on a few little sewing crafts. I thought that sewing would aggravate my repetitive strain injury symptoms, but so far it hasn't been too bad at all.
I admit, though, that sewing for me involves 2-3 hours in a day, with many, many breaks. I take breaks not because of the pain, but rather because I stop to look up various things online. Sewing is a meditative activity that brings on lots of thoughts and ideas, rather than an intense, time-critical activity like programming in which distractions are to be minimized.
Therefore, it makes sense that I'd naturally take plenty of breaks while sewing, but not while typing and coding. If it were the other way around, I'd never get any of my official work done.