Hi I'll b in Beijing on aug 4 th n planning to climb 2 different adventurous part of the wall .

For different sections, it is suggested to go to Mutianyu and Jinshanling areas.
Since you have about four people, it is suggested to hire a local car to take you to reach directly and the tour guide is not very needed. You can just enjoy the scenery. I only know the price for hire a car to Mutianyu, which is around 300 to 400RMB.
I think you can ask the hotel to see whether they can help you to get a car.

Thanks Gina that helped