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Pen and Paper at the ready
If you are ever going somewhere moderately important, always, make notes. If you don't you will find yourself forgetting what was said, or getting somewhere at the wrong time, a pen and some paper, always comes in "handy".
Back when I was at high school, I wish that I had taken more notice of what was being taught, and scribbled down more information that would have been helpful when it came to exams etc.
If you go to the doctors, and they give you instructions on what to do with your medication, or where your next appointment is (if its a big hospital) taking notes would come in good use.
So take a pen and paper with you everywhere.
Always :)