1. Accommodation: Considering the location and route of Niujiao River, you can choose to stay in a hotel near Tian Quan or Niujiao River. In this way, you can start directly from Tian Quan or Horn River the next morning, which saves the traffic time and trouble in the center of Ya 'an.

2. Transportation: From Ya 'an, you can take the shuttle bus from Ya 'an to Tianquan directly, then take the shuttle bus from Tianquan to Zhou Ang River, and finally walk to Erlang Mountain Horn River Scenic Area. Or, you can choose to rent a car, so you can arrange your trip more flexibly.

3. Itinerary: If you choose to live in Tian Quan or near the Horn River, you can leave as early as possible in the morning and make full use of your time to visit the Horn River scenic spot. There is also sightseeing bus in the scenic spot, and the round-trip fare to 35 yuan can take tourists to the top of the mountain cableway, which saves the trouble of hiking up the mountain.

Generally speaking, if you want to enjoy the free travel experience and can arrange your own itinerary, driving or renting a car may be a better choice. If you don't like driving or renting a car, it is also feasible to choose public transportation. Either way, making detailed travel plans in advance, including transportation and accommodation, can make the trip smoother and more enjoyable.