I'm looking for a tour operator to take three middle aged adults and two teens to the Mutianyu section of the Great Wall. We want to take the cable car up and tobaggon down. We do not want to stop at any shops or restaurants there or back. I've been to Mutianyu before and speak Chinese, but my relatives don't. Can anyone recommend a good tour operator to pretty much get us there and back, without add-ons? Thanks!