You probably know the area you live in pretty well. How often do you get stopped in the street and asked for directions to a landmark? That knowledge could be turned into money with a little entrepreneurial spirit on your part. You could become a tour guide for tourists visiting your town or city. If you live somewhere that gets visitors from elsewhere regularly, you could find yourself in particularly high demand.
The website Vayable.com allows you to set yourself up as a tour guide and offer your services. Look for something quirky that's going to catch people's eye; how about your favorite bar that most tourists don't know about? An area of natural beauty that's off the beaten track? Most importantly, be friendly and charismatic. The more people rate you as a guide, the busier you'll become. Charge a fixed price per tourist, run big groups, and you're onto a winner.