When I studied I worked at a grocery store part time, and found it a very good fit as it was mostly mechanical work requiring very little mental capacity.

After I graduated and got a programming job, I found that my hobbies took a big hit, as they all mostly required similar mental focus as work. So these days I generally do a lot less mentally taxing things. Sure I'll have bursts of creativity, but most days my brain is spent when I'm done at work and I'll go for a bike ride or watch a movie.