Hakalau Forest National Wildlife Refuge is a unique and biodiverse area in the state of Hawaii that is home to many rare and endangered species. Some of the reasons to visit the refuge include the opportunity to see rare birds like the Hawaiian hawk, Hawaiian honeycreepers, and the Hawaiian owl, as well as rare plants like the Koa tree. Visitors can also enjoy hiking and birdwatching on the refuge's various trails.

One of the most interesting facts about Hakalau Forest National Wildlife Refuge is that it was established in order to protect critical habitat for the endangered Hawaiian hawk, which only has an estimated 1,500 individuals remaining in the wild. The refuge also protects habitat for other rare and endangered species like the Hawaiian hoary bat and the Mauna Kea silversword.

The best time of year to visit Hakalau Forest National Wildlife Refuge is from December to May, when the weather is generally dry and sunny. However, visitors should be prepared for rain and fog at any time of year, as the refuge is located in a high-altitude rainforest. Visitors should also be aware that access to the refuge is limited and requires a permit from the U.S. Fish and Wildlife Service.