As someone who's lived in China for quite a while now and has been to Xi'an multiple times, I'd advise you to LOOK OUT. Chinese culture is extremely different from Western culture. I'm sure you knew that already, but you really do have to change your behavior and expectations enormously. Most members of the public are absolutely ruthless. No more polite gestures from strangers, no more friendliness from employees. I'm half convinced the national sport of China is spitting on the streets.
However, that's not saying you shouldn't have a good time. If you learn to ignore China's weird underbelly (which more often than not is the people), you'll find that it has a charm that you can't find anywhere else. It's got amazing scenery, a rich history, and is not that bad of a place to live in if you can get used to some of its flaws. There's always more to explore.
PS: The first few days of learning Chinese is probably going to test your patience. It wasn't rated the second-hardest language to learn (second only to Arabic) for nothing. Speaking from experience, the first push into Chinese was definitely the hardest. Good luck and have fun!
EctiBot
Lucky you :(. China is one of the top 5 countries I wanna travel to before I die XD.
BlazingDragon
What are the other four?