Hi Jaya/Eve,
Just a few comments about the excursions - first of all, even though it is expensive the Zambia add-on was the best part of the tour! Don't get me wrong, South Africa was amazing and is probably still my favourite country but we just had so many brilliant experiences in Zambia I would say if you can do it and the excursions, then please do - I'm sure you won't regret it!
The Kruger game drives were largely included when we were there - I think there was one optional drive, which I did. There is such diversity at Kruger; we saw a couple of lions and had a glimpse of a leopard, fantastic!
We didn't have the option of a Cape Town township tour but we did the Knysna one, which was very interesting especially visiting the primary school. I'd say you'd only want to do one or the other, so if you can wait till you get to SA and quiz the TM about what's involved in the two tours and then decide which you want to do. The Mount Nelson afternoon tea wasn't on offer when we were there, so I can't advise about that.
For the Zambia excursions, I'd say you'd want to do either the chopper ride over the Falls or the microlight and not both - one lady did both on our tour but I'd say it's an either/or situation - I did the helicopter (30 mins) and loved it. It was brilliant not only seeing the Falls from above but also a herd of elephants!
Livingstone Island is expensive but we got to go right to the edge of the Falls (it was dry season) on foot and also had a boat tour along the Zambezi, as well as an excellent lunch. The Royal Livingstone Express is a must, a wonderful steam train like the Orient Express with a gourmet dinner in elegant surroundings as you make your way through the national park at sunset!
The Chobe NP visit in Botswana is a must - a fantastic experience in a world famous park. On the way there we saw the point where four countries meet on the river; the morning consisted of a river cruise where we saw an amazing amount of hippos, crocs and other wildlife, especially birds. We had a great buffet lunch and then a 4x4 game drive where we saw huge numbers of elephants.
A couple of folks on our tour did the museum but said it wasn't that exciting. I did the elephant safari and enjoyed it - hadn't been on an elephant before - we saw very little wildlife but it was fun and also great to be able to feed the elephants afterwards. They seemed to really enjoy it too - one lady dropped her shoe getting off and the elephant bent down and picked the shoe up with its trunk and handed it to her!!
I think that just about covers anything but if you have any questions I'll do my best to answer them!
Cheers,
Bob