The national parks of Tanzania are large in both size and number. Many of the main roads pass through them. A bus journey can prove rather interesting. It's not a paid up safari with rambling, but it is free.
I was impressed by this story on the bbc about the Selous Game Sanctuary.
Tree-climbing rangers help save Tanzania's endangered rhinos
Unfortunately, while passing though a national park in the bus, I've never seen a rhino. In fact I've never seen a rhino on an actual safari in Tanzania. I did see a rhino on a safari in a taxi in Zambia. The national park is connected to Victoria Falls, and has hippos in the Zambezi.
I took that photograph from this bridge.
Zambia is on the right hand side, and Zimbabwe is on the left. With a temporary pass from the customs chaps you can go onto the bridge without going into Zimbabwe. The bridge isn't in either country.