To wander is to explore, to explore is to discover. I don't know where I am, I don't know what I am doing here, but I am enjoying every single second of it. If you don't go out and wander, if you don't walk around aimlessly, you don't hear the horns of the cars, hear the footsteps of the people, smell the foods, relish the busyness of the area. Discover things you don't know are there. The best way to know where you are is to not know where you are.
One of my favorite photography exercises is to simply wander. I find a good location to begin and wander around for a few hours, looking for perfect photo opportunities.