My family just returned from a week on the Big Island of Hawaii where, although we did not visit the Mauna Loa Volcano (the largest in the world -- and still active), we did spend a day zip-lining. When we got home, I discovered an article in the new Los Angeles Times Saturday section about local zip-line adventure outfits, so thought that my experience might be worth chronicling if indeed we Southern Californians are going to spend more time zipping around local forests and mountainsides.