Route from Cody to grand Tetons

Just to add unnecessary detail to the already correct answers above.... Head west out of Cody through the East entrance station of Yellowstone NP to Fishing Bridge. Turn Left at the junction and drive south along Yellowstone Lake to the junction with the South entrance road and turn left again. Continue on the South entrance road through the South entrance station and then on the John D. Rockefeller Memorial Highway through the north entrance to Grand Teton NP. When you pass Jackson Lake with the beautiful Teton range on your right you have arrived!!