The bus ticket you buy to start your trip allows you to make free use of the bus system during your stay in the park. This means you can camp one night in a unit, hike to the park road in the morning, and ride the bus to any other unit. The advantage here is that you can see far more of the park during your trip. This type of trip is the most flexible, too, meaning you have the highest likelihood of getting the backpacking permit you desire.
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