I've done a turnaround in ACC last year.. that was probably my most interesting experience to date..... I didn't have a visa for Ghana either.. so I was escorted over to the transit area, my passport and tickets taken from me, and I sat waiting there for half an hour... going crazy about the fact that my passport and ticket could have just been stolen from me by unscrupulous government workers...
but luckily, I did get my passport and tickets back along with the return boarding pass...
was travelling on British Airways, and the turnaround time was about 2 hours.. there was really nothing at the ACC airport, except for a few shabby shops and some benches to sit on... There was a generic airline lounge there as well... here are some of the pictures I took when I was there... yes.. I know pictures were forbidden in that airport, but I did it anyways...
oh yeah, login is ft and password is flyertalk
http://www.fung.net/Flights/game/13.htm