Cuc Phuong National Park is located in Vietnam and contains 200 square kilometers of rainforest. It offers various activities for visitors and the best time to visit is during the wet season from May to September. Nairobi National Park in Kenya is the smallest park and does not have a large variety of animals. It has an orphanage that cares for abandoned animals. Everglades National Park in the US spans both tropical and temperate zones but is endangered due to toxic chemical levels in the water contaminating the environment.