I am 82 and my wife is 77. I am in fairly good condition but my wife recently had spinal surgery. My wife has never seen Yellowstone or Tetons but I have. I think that she would enjoy scenic Snake River raft trip and sights of Yellowstone. However, at our age we no longer do horseback riding or bicycling. Does anyone know if there are other less active alternatives to horseback riding or cycling? We have been to Rapid City numerous times.