What does you do when it's your 47th birthday, and a marathon just doesn't seem to thrill like it used to? Try riding a unicycle to the top of Mount Diablo. That's what Orinda physical therapist Steve Meagher did this weekend, pedaling his one wheel for twelve uphill miles. According to the Contra Costa Times, Meagher bought a unicycle three years ago on a lark and played around with it, but it was only when his birthday rolled around again that he began to take the project seriously. Meagher's daughter Bridget was waiting for him at the top.