There are very few majors / areas of study where a single focus isn't significantly improved with a minor - and frequently, if it's not your major, Comp Sci is a great additional skillset. This is especially true if you need to take the credits anyways, and can choose between random course, or completing a minor with just a bit more work.

You want to do science? Almost no area doesn't need programming as well - it will help you get into grad school. You want to work in business? You'll spend half your day working on spreadsheets, and a CS background is invaluable for making that work better.

You want to do computer programming already? Great, what type? because a minor elsewhere will be a bonus! Video games? Comp Sci + Graphic Design or Literature Corporate work? Comp Sci + Business, Accounting, or Finance.