Transit Visa for 18 hours transit in Beijing Airport to go outside

I am an Indonesian and my friend who is travelling with me is a Malaysian.
We are travelling from South Korea to Turkey and will have 18 hours transit in Beijing Aiport midnight to 17.30 in between the flight.
We are thinking to go outside and have some tours outside the airport.
Can we get permit directly at the airport for going out from the airport?
If yes, how much is it?
Thank you