PETER Mitchell spends a lot of time chasing cartoon characters, especially Big Bird from the popular TV series, Sesame Street. He may also be found tracking Bart Simpson, Kermit the Frog, and Snoopy as well as bicycles, running shoes and even circumnavigating New Zealand.Mitchell’s journeys may sound a bit esoteric, but they are all carefully traced, digitally, on a map. The Safety Beach runner follows what he calls a “creative pastime – GPS Art”. Before setting out on a run Mitchell draws his course on a map of the area which is then able to be called up on his…