How about a Marathon. One end of Sirius to the other with no defined track. Its about knowing the maps too. Not as dangerous but be a different skill than the Starflyer one.
Though the one anachronism about these proposed Olympics is that the Greeks didn't do teams. They were bloody obsessed with individual accomplishment (rationalize that with the completely group oriented Hoplite Phalanx, if you can). But maybe what you could do to compensate for this is take the best individual in the whole Olympics and name a planet in the next release after him.:cool: