Travel south from Livingston, MT along the North Entrance Road to enter the park at the north end near Mammoth Hot Spring.
Very crowded in summer. Early spring may be best for more wildflowers and less people. Camping is difficult to find inside the Park but lodging in West Yellowstone (in Idaho) is reasonable.
Hot spring along the on-way loop near Mammoth Hot Spring at the north end of the park. Nice clouds during this summer day.