Highlights / Diving Highlights South-Africa / Mozambique

Hi,

We are travelling at this moment in South Africa and we are heading up to North of Durban now and go further to Mozambique.

We have lesser time left, so we want to do some nice things in the rest of South Africa / Mozambique.

We are going to dive in Mozambigue for the Whale Sharks and the Giant Manta, but don't know what to see more in Mozambique, or maybe nice things in South Africa.

We like to dive with Dolphins in Sea, but don't know where to do that? And is it worth to do diving in Sodwana Bay if you also go to Mozambique?

Is a hippo cruise nice or not and what are nice things in Swaziland.
Of course we also visit krugerpark, but want to know what is best to visit between Durban and Kruger for the South African / Mozambique part, for sight and for dive spots?

Thanks.