Catching wahoo in the Cayman Islands. The Cayman Islands, a British Overseas Territory, encompasses 3 islands in the western Caribbean Sea. Grand Cayman, the largest island, is known for its beach resorts and varied scuba diving and snorkelling sites. Cayman Brac is a popular launch point for deep-sea fishing excursions. Little Cayman, the smallest island, is home to diverse wildlife, from endangered iguanas to seabirds such as red-footed boobies.