Company Overview. Skyline Hawai‘i is a Maui-based eco-tourism company that offers zipline tours and vehicle tours of Haleakalā National Park. We established the first commercial zipline in the United States and are one of the most awarded tour companies in Hawai‘i. As a company, we are also passionate about conservation. In addition to donating more than $1.8 million to environmental and other nonprofits, since 2002 we have worked diligently to r...