The only activity on this list I actually enjoyed was learning how to pick a lock. Not as a means for breaking and entering, but as a skill and an end in itself.
To me, it is all about learning to create something, preferably with a certain artistic value. Over the last few years, I have:
* Designed and built a clock (out of wood, steel and ropes).
* Designed, printed and bound a few notebooks and diaries, and two books.
* Improved my writing skills; both fiction and non-fiction. Wrote several short stories and started a working on a book.
* Bought a fountain pen, re-learned proper penmanship and developed a personal script.
* Learned how to run correctly and started running barefoot (I run 50 miles per week now).
* Borrowed my uncle's SLR camera, learned a lot about photography.
* Wrote, recorded and edited a short movie with some friends.
* Studied music theory and started playing the piano, albeit with to much ambition. I'm just not able to express myself through classical music. These days, I prefer to play blues on my guitar, or jazz standards (1930s-1940s) or stride piano when the mood is right.