I'm very relieved to see this post.
My problem is that something that I really enjoy - travelling - is something that costs quite a bit. I went to the US in January, and I miss being a tourist so much. I like to write fiction, but I don't see travel writing as something I'd like to do.
Any ideas, anyone? Nothing else got me quite as happy as being a wanderer. Aside from that, and writing (which I have a love-hate relationship with), nothing really makes me that happy. (You can bet on your life I know what will make me unhappy, though.)
That said - thank you for this article. The criteria in particular were really helpful.