First up the Bat Jet Ski Boat, don't look at me, that's what they called it, I would have just called it a Bat-Hydrofoil or something.
This boat that looks more like a submarine made it's appearance towards the end of the movie, when Batman was jet ski boating through the sewers of Gotham to the Penguin's hide out.
Next out of the gate is the Batmissile, which is really a different configuration of the Batmobile. Who didn't think it was cool when the Batmobile ejected it's fenders and reconfigured it's wheels to form this sleeker version to get through the tight alleyways of Gotham? The only thing that bugged me was what happened to the fenders, or what was left of them? Did Alfred have to go pick them up?
Finally the villains ride. A huge Duck. I believe this was supposed to have been taken from what was left of the old abandoned zoo that Penguin lived under. I always got a kick out of the scene where Penguin returns to his hide out and this thing sort of six wheel drives out of the water and up a ramp, just looked funny to me.
So there we have it the Die cast vehicles of Batman Returns! Jet Ski Boats, Missiles, and Duck, oh my!