Planning a trip thru next year on the way to GTNP and YNP. Traveling from east to west. I hope to stay at cedar pass go to visitor center then drive along the loop road and around via sage brush creek road. I see that you can go south thru the park and then west on BIA road 2 to Buffalo Gap, SD and then on to Hot springs. Is this possible? If so how long would it take without stopping very much? I appreciate any help.