Premise: Just 17 miles (27 km) from Kauai, the 73-sq mile (189-sq km) island of Niihau (nee-ee-how) is called  The Forbidden Island  because it is privately owned and cannot be visited without an invitation from one of the 225 inhabitants.

Hypothesis: You must take a boat between Niihau and Kauai.
Relation: neutral