I'm of three minds about that.
I've always wanted to be a concept designer for video games. I think I like designing games more than actually playing them... usually when I'm playing a game, I'm picking apart the elements and mechanics and why they work well or don't. Something about creating systems that are fun really appeals to me. I've actually been studying the psychology of it for the last few years and become something of an expert.
But realistically, I would only want to do this if I had creative control, or as a consultant. I'm not sure I'd like having some wishy-washy role on a team where I had to vie for influence on the final product. Plus, the usual design team roles like graphic design, coding/content creation, writing, etc... don't really interest me. It's a job that doesn't really exist, I guess.
I think I'd also like being an interior designer. Sounds weird, I know. I just like the challenge of combining functionality with artistic expression in three dimensions, mediated by what's actually available to use, what fits the budget, and finding the coolest **** while shopping. And then after working with all those elements, the final product just kicks ***.
I actually really like being a professor, too, but I'd rather have a more flexible research role. I like having some incentive to publish besides fear of perishing. Or really, I'd be happier just designing the research and letting someone else do all the actual work :p Anyway, I like teaching, like getting to study what I want, and in my field you can branch out into almost anything that interests you. Health and psychology are both very flexible fields.
But if I could do one of those other things professionally or just as a gig, I absolutely would. They're the kind of hobbies that it actually really helps to have as a job... gives you the opportunity to really bring your work to life.