Like this question: what do you wish you could write (not what you're writing now)?
I know, it's a biggie. I had to think, but not too long. Because aside from my love for all things crime and mystery, I also have a soft spot for science fiction. I don't really have the skill to do all the world-building involved (I think I'm too impatient...), but I admire authors who do.
So for now, I'll stick with writing mysteries and thrillers. How about you? What craft would you learn if you had all the time in the world?
Here's a beautiful song to inspire you. A bit long at six minutes, but well worth the listen, I promise.