Hydrologists are basically scientists who specialize in water. (Which is pretty cool, because water just happens to be the source of all life on the planet.) You get to be on boats, on beaches, in underwater caverns, and on icy glaciers as you study, collect data, and give expert advice on anything and everything related to—you guessed it—water. You'll also use computers and other high-tech equipment to evaluate and report on your findings. Like Indiana Jones, sometimes you're in an office, sometimes you're in the field, so life never gets dull. Be prepared for some years in school at first—you'll most likely need a master's degree—but if you don't mind getting wet, this could be a sweet career.