I am a solo traveller and will be in Zhangjiajie for 4 days to visit top attractions.

I was just wondering instead of taking taxi can I actually rent a scooter to explore the area by myself? For instance, am I allowed to go to Tianmen mountain by my own or everyone must use the minibus they provided?
Do you have any idea where to rent a bike and how much does it cost per day?
I appreciate your valuable answers