Would you consider a helicopter ride? My family went on that trip when I was 7 (and the little bro was 4), and we did a helicopter tour somewhere in the Badlands area. It was awesome. It didn't last very long, but it was LOUD, and exciting, and we were in a helicopter, and we got to wear helmets and headsets and talk to each other, and it was great. Neither my brother nor I were scared, but then again neither of us is scared of much.