I'd say tours in the Towers would rock.
Possibly more rides in Katanga? Or possibly Haunted Woods? Both are strong in theme, yet are currently lacking in rides (also, put the old red boats back in the Rapids. The yellow ones bite).
I agree, there are still some of the red boats on the rapids but the yellow ones are cheap and unneaded. I think the red ones were more comfortable, held more people and created a bigger splash. The yellow ones however are hard yellow plastic, the seats have no headrests and the yellow sticks out like a sore thumb.
Plus i think some body mentioned something about this in KChttp://www.hussrides.com/34GiantDelirium.htm
I wonder if it would ever be considered, centinally looks doable and already themed to fit the area.