Julie,
I would say not too specific at all, if anything, you'll need to narrow it down! GIS and the geospatial analysis that it allows is applied science, and it can be applied to...anything. Anything related to the environment, business, engineering, pretty much any industry has a space and a need to know where things are and how they relate to each other.
In Education Services at Esri I no longer interact with people who do the exciting stuff, outdoors, but there are lots of them, here and in other industries. I worked in engineering consulting, building roads and bridges, and between GIS analysts, map-makers, survey folks, CAD engineers, and remote sensing analysts, there were a lot of us needed to support that work.
My advice is, think about what industry or career you want to target, and then apply GIS to it. You'll be extremely marketable if you know, say, urban planning, or marketing, or whatever, and then also GIS and how it can be used in addition. Good luck, contact me through the course if you have more questions!