The town has a total population of 181,966 (2009 census) According to records
The main industry is agriculture, especially floriculture.
Naivasha is also a popular tourist destination. Hell’s Gate National Park (the main locations for Lion King, including Pride Rock and the Gorge, are modelled after the park[3), Longonot National Park and Mount Longonot are nearby attractions. Tours also have included Lake Naivasha, to observe bird life and hippopotamus behaviour,  as well as other wild animals.
In the late 1970s–1980s Lake Naivasha was overrun with poachers and foreign creatures introduced into the lake to provide fishing.The migratory paths along lake Naivasha were being destroyed by the local rose industry.Naturalist, Joan Root (1936–2006), spent the last decade of her life trying to save the lake and its wildlife.
courtesy of Wikipedia