The Marvel comic and the radio series devoted an installment to Luke's skyhopper days with Biggs. It could be like American Graffiti, only with sandpeople.
I've long imagined Yoda being more reckless and crazy than Luke in his youth. The advantage of being more than 800 years old is few of your peers know what you were like as a padawan. The transition into the Yoda we know and love might be a compelling story. ;)