Mechanical Engineers create lots of things- from kids toys to car engines. Basically, mechanical engineers create anything that involves a mechanical process. Mechanical engineers work in nearly every area of technology. They also make things like roller coasters more safe, design prosthetic body parts to help people in need of them, design surgical robots to make surgery easier and safer, etc.
I find Mechanical Engineering interesting because you can design many things. You can help many people by designing medical devices or simply make a new toy to make someones day more more fun. You can work in many ares of engineering, so you dont really have to choose one specific area.