Kauai' Kauai is an island located in the Hawaiian archipelago and is the fourth largest of the main Hawaiian Islands. It is also known as the 'Garden ISLE' due to its lush tropical rainforest and abundant vegetation. Kauai is a popular tourist destination, offering a variety of activities such as hiking, snorkeling, and surfing. The answer to the crossword puzzle is ISLE, which is a four-letter word meaning a large landmass surrounded by water.