I will be in Xi'an for 3 full days.

Day 1: You can start your journey with the Terra Cotta Warriors and the Huaqing Hot Spring in Lintong District. In Eastern Square of Xian Railway Station, there are tourist buses No. 5 (306) available to these two places.

Day 2-3: You can visit Shaanxi History Museum in the mroning of the second day. After that, head for Mt. Huashan for fun. You may consider taking the cable car up and staying on the mountain for a night. On the last day, fully enjoy the scenery and hike down.