Carnival offers three dozen shore excursions to rainforests and tropical jungles.  Here are some of our favorites. 

Costa Rica: Get a bird's-eye view of this Central American rainforest, renowned for its biological diversity, on an excursion called High There! After touring a private reserve of old-growth rainforest at ground level, board an open-air gondola and cruise for more than an hour above the canopy.  Then get a close-up and thrilling view of a zipline.

Dominica: On the Caribbean's Nature Island, visit a village 3,000 feet above sea level on the Rainforest Aerial Tram. Board the open gondola for a 70-minute ride through all levels of the rainforest-from just over the forest floor to high above the canopy.  One of the biggest thrills comes as you dangle 300 feet above a river gorge.

Alaska: Not all rainforests are tropical.  In Juneau and Ketchikan, you can hike or zipline through towering conifers of the coastal temperate rainforest.  In Juneau, take the rainforest and Sea Coast Nature Walk.  Follow a naturalist through the shadows of towering conifers.  In Ketchickan, opt for the Bear Creek Zipline and Challenge Course.  Speed among the spruce and cedars on a zipline, walk a rope bridge and enjoy views of ocean, forest and mountains.