Two days is enough to visit Yan 'an City.
I think you are more interested in red tourism when you come to Yan 'an to play.
The first day I went to Zaoyuan, which was the command post of Lao Mao and others.
I went to Baota shan the next day, which is what people think of as Yan 'an.
The itinerary I arranged is very interesting, and I am not tired at the end of the day.
You can go somewhere else or not,
If time permits, you can go to Huangdi Mausoleum and Hukou Waterfall, which are located in huangling county and Yichuan County of Yan 'an respectively.
Have a nice trip!