If I'm just walking around, I leave the camera in Program. If I find something along the way that I really like and that I want to spend more time on, I will switch to Av, Tv or full manual. If I go to a location specifically to shoot something, I only use full manual. On an average "walk around" day, my breakdown is like this: Program: 80% Av: 10% Tv: 5% Full Manual: 5% Full Auto: 0% What about you? What do you shoot in on an average "walk around" day and why?