I am heading to Beijing en route to Thailand and will be staying for 3nts. We're doing as much as possible on points and therefore would like to stay at either a Marriott or Hilton property. Any recommendations of which is better in this city?

We're also planning on doing a day trip to the Great Wall - any suggestions on tours or should we do it on our own with public transport?

Any help, advice would be greatly appreiated.

Thanks!!!