My husband and I are driving up to Kenya via Botswana, Zim, Zambia, Tanzania and possibly coming back through Uganda and Rwanda. Any advice please on Border crossings, daily budget and distances possible in a day's travel.

Is it better to avoid Tunduma and Chirundu? We're planning to cross into Botswana at Martin's Drift then go north to Plumtree and cross into Zim there. After that we need to get through Zambia and Tanzania to Nairobi.

What are the must sees.