The "Dollar Cab"... Actually costs $2, but that's what it's called. Think the local bus service.
Circles the island, hop on hop off. Open air safari cab, 16 seats. Just wave your hand and they stop, push a button and they stop to let you off.
No set schedule, they just have dozens of these. Wait a few minutes and one will come by.
Not always the most scenic views, but gets you around the island cheap.
