My wife and I visited Botswana as part of our "Desert & Delta" safari in August 2015. Apart from Namibia's many deserts we also spent some time in Botswana, mainly in the Okavango Delta (hence the safari's name) and the Chobe NP. Renowned for their abundant wildlife, neither of them disappointed us in any way. We saw elephants, hippos, crocodiles, zebras, antelopes, springboks as well as countless birds - and took a photo of nearly all of them!
Both areas are a must-visit, but I'm sure there's much more to see in this lovely country.