Chitwan National Park
Chitwan National Park is the place to come to experience a different side of Nepal. This is a wonderful place for wildlife viewing and it has a safari-type atmosphere. At an altitude of only 100 meters in some areas, much lower than Kathmandu at 1,400 meters, Chitwan has a tropical monsoon climate, quite different than what you’d expect to find in Nepal.
Travelers come here to see wildlife. The park is home to rhinos, Bengal tigers, leopards, sloth bears, gaur (buffalo), deer, and many other critters. Freshwater dolphins (gangetic) and crocodiles inhabit the rivers and streams but are rarely seen. More than 500 species of birds make Chitwan a paradise for ornithologists. Tours from the lodges take you out into the park, either on foot, or more often, on elephants for close-up views of the animals.
Chitwan lies southwest of Kathmandu close to the Indian frontier and is included in the UNESCO list of world cultural heritage sites.
The best time to visit Chitwan is from October to February. Average temperatures hover around 25 degrees Celsius (77 degrees Fahrenheit), with high humidity, although the mornings can be quite cool. June to September is the monsoon season, with frequent and heavy rain. source