It depends on what kind of "things" you want to design. Bridges, dams, buildings, roads? Civil and Structural engineering. Computers and electronics? Electrical, electronic, and software engineering. Machines and devices? Mechanical engineering. Most engineers in all fields will at some point encountner options that lead them more toward administrative and management, or toward hands-on design work. Think about it, most engineers work in an engineering department for a larger business. Someone has to manage the departments and the business, no matter what their field of business is. The best engineers have a good amount of experience in both.