If you had driven through Shoshone NF during the day time you would have seen all the "be bear aware" signs (griz). Part of the experience though. I've driven the Cody to the East entrance numerous times and think that part of the drive is just as pretty as the Park itself. You used to see elk, moose, and deer everywhere around there, as well as bighorn sheep herds right along the highway. Not so much anymore, but that's a differnt topic all on it's own and tends to get locked rather quickly. Not too sure about Eastern WY but in Central and NW WY hunting antelope by car is very doable, especially if you butcher it right there and through it in a cooler.