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I can highly recommend Mkhaya private game reserve in Swaziland. Its top class and as its their land the rangers can drive off road and right up to the animals. An elephant came within 1 foot of my face at the front of the jeep - thats something I'll never forget. You stay in as much luxury (a class stone hut which is massive) as the private reserves in South Africa, get 4 top quality meals and 3 game drives during your 24 hour stay - and I think it worked out at €100 each for the whole lot, as opposed to €800-€900 each for the private game reserves in SA. Only bad thing I can think about this park is theres no cats, but I still recommend it as its an amazing 24 hours stay (staying for one 24 hour day is long enough) and then you can go do some cat spotting in another park.
haven't been to kruger as my South African colleagues advised staying away - they said its way overpriced, and is so massive it can be a bit hit and miss.
Hluhuwe-Umfolozi park is another brilliant one I went to - did a full day guided tour there and covered 250 miles and saw plenty. Guided tour is better if you ask me as youll be surprised how much better the guides are at spotting things even from a distance when driving. Safari is absolutely brilliant, and I'd love to do a walking safari just to get the feel of being out there amongst it (though youll probably see less animals - HU have a good walking tour but book well in advance as for all tours), but if you're just driving 2, maybe 3 days tops will do it.
Also in that corner of the country (Kwa-Zula Natal or whatever its called) is the amazing Sodwana Bay - one of top ten scuba locations in the world and an amazing beach and nature reserve (few animals but great scenery) to boot - waking up to find 3 monkeys playing in our outdoor shower is somethng I won't forget. And the St. Lucia National Park is good for hippos and crocs.
I was only there for 3 weeks and will be back, but managed to fit plenty in. 2 days capetown, then few days up the garden route (knysna and plettenburg bay are lovely, and the Otinequa Tjoe-Choe scenic train journey from George to Knysna is great), and fly up to Durban (got it for €50 each, day there and drive up to Hluhuwe-Umfolozi/Sodwana Area for couple of days, then 2 nights in Swaziland then fly to Jo'burg (got it for €75 each) and home is the bones of what we did and it was amazing.
i had a post on
www.lonelyplanet.com in the thorn tree forums section on africa about it but cant find it (it was around September 2004) but if I find the link I'll but it up. Otherwise check out that forum for great info on itineraries and flights etc.
PS. IMHO joburg is an absolute hole so stay a maximum of one night