Elephants are big. They sometimes trample those in their way. I don't think it's that rare, but they are also very docile creatures and would probably attack if you offend them or step into their territory. As long as you give them space in these open areas, I think you'll be fine. If they weren't raised to be friendly tourists, then you gotta keep your distance. Elephants are awesome, they are gentle giants and would treat you right if you give them their space and respect.