Hi Kyoto49
Welcome to the forums.
Having grown up in Port Elizabeth, I can confirm that driving in that place is a breeze, compared to Johannesburg, it qualifies as a sleep town. You will find it real easy to get out of the airport to Addo, and from Addo to George is also a breeze. You will be travelling on the National route, and the speed you travel is up to you. And the airport is small, if you get lost there
And as has been mentioned, once in the Addo, you will have very little traffic, certainly nothing to worry about. Only the pleasure of being as close to nature as possible. Your young daughter will enjoy that far more. Nothing quite like meeting a gentle giant of an elephant bull on the road.
Now you have got me wishing I was still living in Port Elizabeth, as I would gladly meet you, drive you to Addo, stay with you there for the 3 days, and satisfy the longing to be in the outdoors. Alas, I am in another jungle now, where there are regular rat-races

Have been to Addo a few times I lived there, and that was long before they introduced Lions. In those days it was still known as an elephant reserve. I do remember though the magic of standing at the waterhole and watching a big herd of elephants coming to drink.
I suggest you make it 3 days for maximum enjoyment. I can guarantee you, you will want to come back, and as a added bonus, you will want to come to the Kruger Park.
Don't recommend hiring a Taxi-it is way above more expensive than hiring a car and having the pleasure of its use.
Let me know when you come to SA for trip to the Kruger-make sure i'm available to meet and transport you there! There is a fee- you pay for me too!
Enjoy your trip.
Noel