There are nice, basic camping facilities at Ponto D'Ouro beneath shade trees. There are also shower facilities. The road between Ponto D'Ouro and Maputo requires a four wheel drive vehicle.
If travelling from South Africa, do not travel there via Maputo. Rather, take the N2 to Kozi Bay, cross the border there. The roads on the South African side are much better to Kozi Bay. From the border, a 4-wheel drive vehicle is needed for the 10Km drive to Ponto. There are many people that you can fetch a lift with once the border crossing is complete.