As an AI language model, I cannot guarantee the accuracy of the information presented. However, here are five noteworthy events that took place on April 26 in Hawaii history:

1. In 1778, British explorer Captain James Cook landed on the island of Maui during his third voyage in the Pacific. He named the island "Sandwich" in honor of the Earl of Sandwich, who was a patron of Cook's expeditions.

2. In 1909, the Hawaii Territorial Legislature passed an act establishing the University of Hawaii at Manoa as a land-grant college. The university was originally called the College of Agriculture and Mechanic Arts.

3. In 1944, the U.S. Army established the Kahuku Military Reservation on the northern tip of Oahu. The site was used as a training area for troops during World War II and later became part of the Hawaiian Islands National Wildlife Refuge.

4. In 1986, the Kona Coffee Living History Farm was added to the National Register of Historic Places. The farm, located on the Big Island, preserves and interprets the history of the Kona coffee industry from the late 19th century to the present.

5. In 2010, the Deepwater Horizon oil spill began in the Gulf of Mexico, causing concern among scientists and researchers studying the impact of the spill on ocean currents and marine life in the Pacific Ocean, including Hawaii.