Although the internet is an awesome resource for researching different careers and companies, nothing comes close to the exposure you gain when work-shadowing a professional in his/her career. It gives you the opportunity to experience the real day-to-day activities of the occupation you are considering for your future career. Make sure that you gain as much as you can from this experience by preparing well and visiting as many different companies in the line(s) of work you are considering. Remember, your decision will become easier with every bit of information you gain.