That is all you need to take a trip around the world for an entire year! The airport has to do with 30km or 45mins by road from the centre of town. As in any nation, in China tourists can easily be targets of minor criminal offense. You set your own priorities and your own schedule every day. On a backpacking budget permit $30-50 dollars a day in low season. The Great Wall of China stretches well over 4000 miles.