1. At Beijing Dongzhimen Long Distance Bus Station, you can take the local bus to Gubeikou Township. Upon arrival at Gubeikou, you can employ a local taxi at the bus station with CNY30 to Jinshanling in 30 minutes.
2. Take bus No.980 to Miyun County from Beijing Dongzhimen Long Distance Bus Station (北京东直门长途汽车站). From Gulou Dajie Street in Miyun County, there are drivers lined up at the stop. You can negotiate with them by CNY 150-200 for a round trip for one car. You have to tell them you will pay the money after returning to this point, and they will wait for you at an agreed time either at Jinshanling or at Simatai.
3. It will cost around CNY 800 for a private taxi from downtown Beijing, and it will take 1.5 hours from Beijing to the wall since the new Beijing-Chengde Expressway was completed on 28 Sep 2009.