Buffalo River area would be neat! I like that idea too and several campground areas available.
Also, the event doesn't need to be inside where you dig for diamonds. That would just be a side thing that people could do while they are down there. I like the idea of a tube/kayak/canoe adventure as well. These can always be optional fun things for people to do while in the area, or a side event that someone hosts.
Mother to 2 dogs - Foxer, the chicken herder and Bo, the pug, 1 kitty chupacabra princess Daksi and Married to a wonderful man, Pizzaboy2600.