Popoia Island, or Flat Island as referred to, functioned as a fishing center in ancient times. But now, this iconic island located about a quarter-mile off the Kailua coast is a state bird sanctuary and breeding grounds for wedge-tailed shearwaters. The island is breezy and beautiful. As the interior of the island is a designated seabird sanctuary, it is not open for visitors. However, you can indulge in the calm experience of kayaking or snorkeling or swimming, or merely taking a walk on the outskirts of this little paradise.