Mount Hua is one of the Five Great Mountains in China. It's located in Huayin City, about 75 miles from Xi'an. It's part of Qin Mountains, which divides Shaanxi Province as well as China.
Mount Hua has five peaks. If you'd like to take a cable car, you'll arrive at the North Peak, and from there hike to other peaks. One of the most famous trails is called Canglong Lin (Dark Dragon Ridge). It's a narrow hiking route with chains on two sides to protect the tourists. When I was a teen, I hiked this trail. I remember that some omeone bumped into me and made me almost out of balance. Luckily, I grabbed the chain and regained my balance. Otherwise, you would not see this piece of writing today ;)
If you stop by Xi'an and look for a good hike, Mount Hua is a great choice. I don't recommend going there on holidays, because it will be too crowded and also can be dangerous to hike. If you go on a clear day, you'll enjoy a stunningly beautiful sight, with pieces of clouds floating below you. Feels like walking in heaven :)