Jon has decided to silly thing (defined as silly, of course, by the fact that I would never attempt such a thing. Myunique activites are not silly, of course -- they merely enchance my character). To wit, he has decided to break the unsupported, unresupplied speed record for the John Muir Trail, and he's launched a blog to document the attempt. I'll let you read all about it for yourself.
I think the distances involved would probably kill me, but I'm certainly interested to see how Jon's progress goes.