I try to do as many things by foot as possible. I live close to the city centre so it's easy do most of the errands by foot. The big electronic markets (where you can buy vital DVDs) are located a bit more outside. But when the weather and time permits I like to walk there too. Since I spend so much time sitting at the computer I like to use those opportunities to move my lazy butt. :) And it's also easy to get there by bus. Public transportation here is okay given the size of our city.
I don't own a car myself but if need be I can use my father's car. Since they live in the same building that usually isn't a problem. But I don't drive very often.
I have thought about using a motor-bike now and then but I really don't want to make special driving licence and I believe with my car licence I'm only allowed to use a very, very small motorbike. Maybe I should look up what I am allowed to drive. And since my hometown is located in a valley, using a real bike unfortunately isn't easy since you'd constantly be sweaty. :)