Now I'm talking to myself.
I couldn't get any answers on this thread or from Carnival. SO! I did some research, found the Appleton Rum Estate online. Their reply to my email indicated that they ARE still offering estate tours. They didn't answer wether or not they are still offering them through Carnival.
At least I'm a little closer to the info I needed. I just don't know where the estate is at and wether it's safe to plan a taxi ride up there.