Go on, let out a wild holler as you soar above a rainforested gulch in Kaanapali or down the slope of Haleakala. Pioneers of this internationally popular activity, the Skyline owners brought the first ziplines to the U.S. and launched them from their home, here on Maui. Skyline has two courses, one on the west side and the other halfway up Haleakala. Both are fast and fun, the guides are savvy and safety-conscious, and the scenery is breathtaking. In Kaanapali, you can even “zip and dip”: drop off your line into a mountain pool. Beyond that, this eco-conscious company is carbon-neutral and donates thousands of dollars to local environmental agencies.