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Observing different species of birds in their natural habitat. Best destination: Costa Rica.

Walking extensively in natural environments on marked trails. Best destination: Appalachian Trail, USA.

Observing whales in their natural habitat from boats or the shore. Best destination: Hermanus, South Africa.

Exploring underwater ecosystems with breathing apparatus. Best destination: Great Barrier Reef, Australia.

A journey to observe wildlife in natural settings. Best destination: Serengeti National Park, Tanzania.

Swimming on the surface with a mask and snorkel to observe underwater life. Best destination: Maldives.

Riding bicycles off-road, often over rough terrain. Best destination: Moab, Utah, USA.

Paddling using a kayak through waterways. Best destination: Milford Sound, New Zealand.

Traveling from one tree to another via suspended cables. Best destination: Monteverde, Costa Rica.

Exploring caves and their formations. Best destination: Mammoth Cave National Park, USA.

Environmentally-responsible fishing practices. Best destination: Key West, Florida, USA.

Exploring landscapes on horseback. Best destination: Patagonia, Argentina.

Volunteering in conservation projects. Best destination: Galapagos Islands, Ecuador.

Gliding across landscapes using a pulley suspended on a cable. Best destination: Arenal Volcano, Costa Rica.

Walking across glacier surfaces with appropriate gear. Best destination: Vatnajökull, Iceland.

Taking photographs of wildlife in their natural habitat. Best destination: Maasai Mara, Kenya.

Skiing in areas with a commitment to environmental protection. Best destination: Aspen, Colorado, USA.

Visiting a working farm or any agricultural operation. Best destination: Tuscany, Italy.

Trekking through the dense and biodiverse rainforest environment. Best destination: Amazon Rainforest, Brazil.

Exploring desert landscapes, usually in a 4x4 vehicle. Best destination: Wadi Rum, Jordan.

Ascending volcanoes, often involving rough terrain. Best destination: Mount Fuji, Japan.

Staying in accommodations that emphasize sustainability. Best destination: Chumbe Island, Tanzania.

Standing on a board and using a paddle to move through the water. Best destination: Lake Tahoe, USA.

Learning about and participating in sustainable agriculture. Best destination: Zaytuna Farm, Australia.