Pilanesberg Game Reserve, in the North West Province has a "variety of habitats, ranging from grassland, woodland, mountains and ravines to bushveld and a huge dam" . Situated in the crater of an extinct volcano. According to SA Tourism's site it is home to over 300 species
Wakkerstroom border of Mpumalanga and KZN. Rudd’s Lark, Bothas Lark, Yellow Breasted Pipit, Blue Korhaan and Southern Bald Ibis, blue and crowned cranes, the white-winged flufftail" "Situated in the Grasslands Biosphere Reserve – South Africa’s largest grassland biome, covering 27% of the country and ranked alongside the Russian steppes, North American prairies and South American pampas." http://www.southafrica.net/za/en/articles/entry/article-birdlife-south-africa
Golden Gate Highlands National Park, Free State - 175 species of birds including buzzards, kestrels, Verreaux's eagles, Lanner Falcons, threatened Bearded Vulture. According to SA Tourism's website "two threatened endemic species – the Yellow-breasted pipit and Southern bald ibis – are present. Other local birds with a limited distribution found here include the blue korhaan and the handsome Drakensberg rock-jumper."
Marievale Bird Sanctuary, about 1 hour south of Jhb - species found there: "Little Bittern, Slaty Egrets, Black and Squacco herons, african rails, crakes, moorhens, cormorants and snipes, also relatively easy to see the Goliath heron, Fulvous duck and African Shelduck. Marievale sometimes ..extremely rare vagrants... sightings of buff-spotted flufftails, buff-breasted sandpiper, SA Tourism's website has lots of useful information for planning a visit.
Bird Island Nature Reserve, off the Western Cape coast. " something of a local hangout for the area’s pelagic birds, the island is also home to roosting terns, cormorants, gulls and a colony of African penguins." according to South African Tourism site.