These days, there are choices to be made when it comes to ziplines around Hawaii. On Kauai, there are two. On Maui, three. And, now, on Hawaii Island, there are also three. On a recent trip to Hawaii Island, I chose Kohala Zip, primarily, for one reason. Their environmental practices. And, also, because, while the name is different, Kohala Zipline is owned by Hawaii Forest & Trail, a company that promotes its tours as entertaining, educational and responsible. Responsible in this case means clearing just a few trees from the forest to create the course and, then, using those felled trees to build the structures--milled and crafted on-site.