If you go during the winter (summer time in the US) it's only in to 70s in SA. Plus everything is DIRT cheap. That cottage there (with full kitchen, bath and 1 bedroom) cost be $110 per night. Cigs are $4 a box, wine $3 a bottle, compact rental car $30/ day, nice luxury hotel room $90, nice dinner at a good place $12. Airfare was $1600 for two.
Also stayed here at the most expensive cottage they had for $112 per night (two bedrooms, full kitchen, 2 baths, huge living room with fireplace, balcony overhanging the lake).
http://www.lakenaverone.co.za/