Island Ferry

I am the owner of a private lot on a private island, and I am looking for a way to make a ferry that goes around the island, either completely around (from my lot around to the same place again) or stopping at a certain lot, controlled by my voice.

Any help on either of these things would be appreciated, but the main, circling "tour" ferry function is what I want to concentrate on. Can anyone help me with this part?

-Zac

There is a Linden "Chairlift" script around that would suit this use.