I've been licensed as a ham radio operator since I was a kid (had an odd, early fascination with radio) and recently got back into it a few years ago.

I find using morse code extremely relaxing b/c it taxes your perceptual system in a way that is fairly uncommon in today's world. Either b/c it is being sent very fast or b/c of a weak signal and ionospheric noise, it's a "full brain" immersion exercise that leaves me feeling relaxed and contented (yes I know it sounds a bit odd).

I recommend it highly. Even for those not interested in radio, there are competitions for high speed morse (it's big in eastern Europe)... check out some of the training software:

http://fkurz.net/ham/qrq.html

and

http://www.rufzxp.net/

Of course, real ham radio contests offer the best combo of adrenaline and strategy...