Most likely, job requirements will include good communication skills so plan on devoting a few courses for writing, communication, and rhetoric classes. Career oriented types might also want to look into taking classes from the business and economics departments. If you want to explore other interests of yours, taking classes in unrelated fields will not hurt. Engineering is not for everybody, and maybe you will find the other area more rewarding. And do not worry about not having enough technical courses.
Employers generally expect recruits to do a lot more learning on the job.
It is very common for practicing engineers to take additional courses during their careers. These course loads can range from taking a few classes once a week to earning an entirely new supplemental degree. Technology changes so rapidly that industry expects engineers to keep up, and will generally pay for the technical and work related courses. But they will often not pay for the ones unrelated to work. So in a sense, college may be the last opportunity for you to take that course in anthropology or art history.