Hi Jacqui,
Don't worry about currency for Zambia as they will take most things including Rand, Sterling, Dollars etc. You must have dollars for your visa though. I will explain the best thing to do re currency for Zambia when we're in SA, but if you have extra dollars or rand etc that will be fine. There is a bank next door to our lovely hotel, if required, however I wouldn't advise anyone to change money to Zambian kwacha.
As for excursions, well it so depends on what sort of thing you enjoy, but for me, I love anything to do with safari, so Chobe is my favourite from Zambia. I also did the microlight a few years ago and that too was fabulous, but guests always enjoy the helicopter......its all decisions!
Really look forward to chatting it all through with you after we meet at Heathrow.
See you soon
Lynne