The drive south on U.S. 191 from Bozeman to West Yellowstone/Yellowstone National Park offers enjoyable scenery, much of the trip right alongside the Gallatin River. It passes spur road to Big Sky, a nice drive up the mountain if you have time for a detour. The route offers a couple of decent restaurants, campsites, horseback riding, river rafting, and some good fly fishing opportunities. The road is quite curvy in places so drive carefully, don't tailgate, and be very cautious if trying to pass another vehicle.
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