This is also a great way to randomly arrive in Siracusa wondering how did you end up there, in some sort of re-enactment of the last Indiana Jones movie.
Well, I guess I was lucky! More seriously: I just followed a local that suggested this, and he knew the right way but from what I remember, it wasn't that hard to catch the right ferry. And, honestly, after so many hours of train, I was happy to physically move around and not wait another 40+ minutes.
This is also a great way to randomly arrive in Siracusa wondering how did you end up there, in some sort of re-enactment of the last Indiana Jones movie.