Who is Tourists from Islands in the Stream and what is their importance?

The arrival of tourists to Bimini usually means one of two things: customers and trouble. An unsavory rich tourist treats one of the young islanders rudely and makes his girlfriend cry. He later pays for this by Roger's bare fists and pugilistic skills. However, a later houseboat arrival brings Audrey Bruce, a family friend, and a boatload of paying customers to Bobby's bar.