If you come by train, go to Pagoda Mountain first, and then go to the Memorial Hall. Finally, you can stay near there, and the next day you can go to Zaoyuan and Yangjialing.
In fact, there is not much to do in Yan'an, but there is a lot to eat. You can go to Zhongzhong Street, near the Fenghuang Police Station, to eat spicy liver bowls, rolled dough, and potato rubs. I think the food there is the most authentic in Yan'an, and
They all taste good. I always eat the spicy liver bowl from Shengdian Dijia there.
I don’t agree with the statement on the first floor. The weather is cold now. I suggest you not to go to Hukou Waterfall. I think it should be frozen and it is a bit far from the city.
I hope it can help you. I wish you a happy stay in Yan'an. Yan'an welcomes you.