If you're already taking photos of your trip, you might as well make a couple bucks off them (and you don't need a fancy camera to do it.) You won't get rich, but you may be able to cover the cost of souvenirs or a nice meal.
Image from Nicolas Navarrete Carrasco.
Of course, you should only sell the good photos. Skip the ones with friends or family in them, since they may not want their image being used for stock photos. Travel+Leisure recommends entering your photos in contests to try for a big payday, but you can also sell your photos on sites like iStock, Alamy, Shutterstock, and Getty Images. If you have video from your travels, you can sell those, too.
How to Make Money While Travelling [Travel+Leisure]