Badaling Great Wall was rebuilt after the establishment of the PRC, therefore, it kind of lacks the natural tasts. Also, it is usually crowded. I strongly recommend the cruise from Jinshanling to Simatai, in which you can take a walk on a 10 kilometer original Great Wall. The whole trip takes 1 day and costs like $10.(Traffic fees not included)I tried it. It's pretty good! If you need further information, please mail yahoo.com.cn|flanker1118, I'll be glad to help.
May your stay in China happay and comfortable.