Tianshengqiao National Geological Park

Just 5 min from the wall, they will drop you as well as pick you up from wall after finished. You can buy ticket from them as well. Basically hassle free end to end service if you are planing to visit wall at Mutianyu The only drawback is that its far from Beijing central and PEK airport. It would take 1hr to 2hr in transfer depending upon day and time of day. The staff (host parents as well as their son) were very helpful with suggestions and any accommodation needed. Homely food made there was also very delicious for breakfast and dinner as well few varieties. Probably you can request in advance any special request for food choices.