The Etosha National Park has a good infrastructure. Well maintained gravel roads (untarred) lead to the waterholes, where game viewing is best. In the three restcamps Okaukuejo, Halali and Namutoni, hotels, chalets and camping sites are available as well as restaurants, stores and swimming pools.
Further information is on the Etosha Info page.
On the animals you can read up in the Wildlife menu of this Online Travel Guide.
Namibia's Etosha National Park is a huge salt pan surrounded by flat bushland. The water-holes, scattered throughout this area, are the basis of life for countless game. Be it a lion or an elephant, a giraffe or a zebra, almost all African animal species are represented in the huge nature reserve, approx. 22,000 square kilometres in size. There is an estimated number of 300 lions in the park, 300 rhinos, 2000 giraffes und 1500 elephants. Particularly numerous are the dainty springbok, of which at least 30,000 specimen can be found here. Often, they can be observed in enormous herds of several hundred animals.