We will be transferring in JNB on our way to ACC, and have something like 8 hours (9a - 5p) to spare there. Should we get out of the airport to see/do something? Since we are technically "transferring", I assume we don't need to worry about luggage? We don't need visa to get in, so that shouldn't be an issue (unless it takes forever to get in and then out of immigration). Any thoughts?