I am going to Xian apr and plan to drop by hukou waterfall n see yaodong.

see from websit can take bullet train fm Xian to Yanan and from there plan whether to take public bus or hire car with driver to these two places the take the train back to Xian for just two person. would like to know 1. which is better route ? 2. will it too rush for one day? or should stay for one night?