Carnet is required for South Africa. (and a lot of other countries too!)
Just came out of Botswana.
- Chobe NP you are not allowed through with a bike, although you will crossi t for about 90 km's on the north driving from Kasane to Namibia.
- Moremi NP you may not enter with a bike, but you can drive about 50km's into the park to the south entrance. You will (and are allowed) to pass the Veterenary gate, then drive these 50k's to the entrance, where you cannot proceed. The animals don't pay entrance tickets though, so you will see some elephants, giraffes, zebra's etc.
With a guided tour (12 hour day tour) will cost you anywhere from 90-120USD per person, depending on the amount of people.
Flight with a Cessna over the delta can be done for <600Pula, about 85USD per person if you can fill up a 3/5/7 seater airplane.
Top tip: drive over the Ntwetwe Salt pan, really nice unpaved track of 160 km's long. Just go south from Gweta.