For a small sum of money you can rent bikes and ride around the Xi'an City Wall or you can just walk it. This wall is lit up at night and is very pretty. It is a great place to take a stroll and view the city from above. Make sure you have time to spent here when you visit China because its the most recommend activity/place to visit. I mean how often are you able to ride a bicycle on top of an 800 year old wall? But if you're short on time, but really want to see the wall, then pick a gate and take about 30 minutes to see what you want. If you have more time, go for a bike ride. If you have lots of time, go for a run around it (8.5 miles). The walls have physically encircling the whole city. You can get up to the wall from different gates (I think there are more than 10 gates) situated at the 4 different side. This is definitely a go to place when you travel to China! And it's good for the whole family!
Unknown, Trip Advisor Retrieved from http://www.tripadvisor.com/Attraction_Review-g298557-d459901-Reviews-Xi_an_City_Wall_Chengqiang-Xi_an_Shaanxi.html
Unknown, Travel China Guide Retrieved from http://www.travelchinaguide.com/attraction/shaanxi/xian/citywall.htm
photo courtesy of http://www.travelchinaguide.com/attraction/shaanxi/xian/citywall.htm
Unknown, Trip Advisor Retrieved from http://www.tripadvisor.com/Attraction_Review-g298557-d459901-Reviews-Xi_an_City_Wall_Chengqiang-Xi_an_Shaanxi.html
Unknown, Travel China Guide Retrieved from http://www.travelchinaguide.com/attraction/shaanxi/xian/citywall.htm
photo courtesy of http://www.travelchinaguide.com/attraction/shaanxi/xian/citywall.htm