My very first well paying 'gig' was sitting around, counting cars... Yup, as weird as it sounds, I made $50 in a couple of hours!
I had a wealthy neighbor who was looking for a good spot to open up a business. So, she asked my parents if they would let my sister and I 'analyze' a few of areas for her, in exchange for cash.
At the time I thought that lady was crazy.. paying us to count cars..But it was worth it. Bought my very first Walkman with the money