LAOS // Sure, there are other zip lines in the world, and other wildlife-filled national parks. There are even other places where you can spend the night in the trees. But the Gibbon Experience combines all of these into one unforgettable jungle adventure. Trek through Nam Kan National Park, buzz across the valleys on a series of zip lines, spot wildlife, sleep, eat and shower in treehouses some 40m (130ft) up, then wake to the eerie whistling of the elusive gibbons' morning song. What's more, tourist dollars here go towards supporting local communities and conservation projects.