On the walkway between Asia & Africa, the walkway splits into an upper and lower path about halfway between the 2 lands. The upper path was a smoking section; I don't think it is now, but I'm not sure. There's a little creek that both paths cross.
On the upper path, there used to be an unpaved trail that branched off into the forest, and crossed the creek on stepping stones. Coming from Asia, the entrance was just past the food stand (Mr. Komodo's?). You could see the main path when you were on the secret trail crossing the creek, but it was very hard to see in from the main path (which I believe is why it was closed.)
I walked the trail many times, and I think only once did I run into another Guest on it.
After it was blocked off, it was still possible to step around the bench and walk the trail for a while, but eventually Disney completely planted over it.
