New Hobby?

Everyone seems to have a thing that they do or want to learn to do that they bring to the Peace Corps and nourish. You know, the guitar-toting hippee and whatnot. Knitting? Too warm. Harmonica? Don't like it. The only two serious extracurriculars that I do are violin and dancesport. My extremely old violin's not coming with me to Africa and I wonder if ballroom-esque movement is culturally acceptable in Burkina Faso.

So what's something smallish, portable, and mentally challenging that would improve with time that I could learn?

Darts? Chess? Underwater basket weaving? lol

But what?