Am I the only one who would love to be a full time programmer given the choice? I actually enjoy engineering, and software is engineering on drugs, with rapid feedback and not as much math. There's not a lot of other industries where you can make a dozen prototypes a day. It's the closest thing today to a full time inventor/mad scientist.
But if I have to pick something else, probably a chef. I love slicing and dicing. I love doing one part to mastery, e.g. finding a better way to cook steak, toast burger buns, make better mayonnaise. I did quit the tech industry once to do a cafe and we had a blast researching recipes. I got quite frustrated that my partner wasn't looking to cook better, only more profitably. One of my favorite documentaries of all time is Jiro Dreams of Sushi, and I apply a lot of those techniques to my current work.