Zhangjiajie is generally safe for solo female travelers. The locals are friendly and crime rates are relatively low in the area. It's important to remain cautious and alert, especially in crowded tourist spots to avoid petty theft. The trails are well-marked and patrolled in Zhangjiajie National Park, but hiking alone is not encouraged due to the risk of getting lost. However, having a local guide or joining a tour group can easily mitigate this risk. Public transport is reliable and convenient, but just as anywhere else in the world, be cautious of your belongings and be careful during late hours.