Walter Sisulu Botanical Gardens

The SA National Biodiversity Institute (SANBI) oversee a number of National Botanical Gardens across the country, probably the most famous of which is the Kirstenbosch Gardens in Cape Town. Some 30 years ago, the Roodepoort and Krugersdorp Municipalities made available some 300 hectares of land to start the Transvaal Botanical Gardens, more recently renamed the Walter Sisulu NBG. 
 Located on the northern slopes of the 'white waters ridge', it is centred around the beautiful Witpoortjie waterfalls and preserves a sample of the Rocky Highveld Grassland and the indigenous flora.  A 4.5 kilometre walking trail winds up the ridge providing spectacular views towards Pretoria and, at the same time, a good workout.
But it is perhaps best known for the mating pair of Black or Verraux's Eagles that have nested on the cliffs next to the waterfall rearing chicks year after year.  They are known to hunt for food as far away as the Magaliesberg. 
A full programme of entertainment is offered including live musical afternoons usually in winter, a Christmas Carol performance and talks on butterflies, astronomy, geology etc.  Picnics on the swathes of lawn and under shady trees are popular and children love the 'train' rides operated by a charity over the weekends. A restaurant offers teas, breakfast and light lunches.  Perhaps inspired by the plants seen in the gardens, indigenous plants may be purchased at the nursery on the way out.

http://www.sanbi.org/gardens/walter-sisulu
http://www.gauteng.net/attractions/entry/walter_sisulu_botanical_gardens/