1. Tsunami Hits Hilo in 1946 - On April 15, 1946, a devastating tsunami hit the town of Hilo on the island of Hawaii, causing widespread damage and the loss of many lives. The tsunami was triggered by an earthquake in the Aleutian Islands and reached heights of up to 55 feet.

2. Princess Kaiulani Passes Away - On April 15, 1899, Princess Kaiulani, the last heir to the Hawaiian throne, passed away at the age of 23. She was a popular figure in Hawaii and had the support of many of the Hawaiian people, but her death marked the end of any hope of restoring the monarchy.

3. First Japanese Immigrants Arrive - On April 15, 1868, the first group of Japanese immigrants arrived in Hawaii. They were seeking opportunities in the sugarcane industry and ultimately became an important part of Hawaii's multicultural society.

4. Pearl Harbor Survivors Return - On April 15, 2001, survivors of the attack on Pearl Harbor returned to the site to mark the 59th anniversary of the event. The survivors, many of whom were in their 80s and 90s, participated in a ceremony to remember those who lost their lives in the attack.

5. First Flight to Hawaii - On April 15, 1927, the first flight from the mainland United States to Hawaii landed in Honolulu. The flight, which took 25 hours and 50 minutes, was a historic achievement and helped to establish Hawaii as a popular tourist destination.