Direct transit with two cities?

I'm a U.S. Citizen with a round trip ticket from San Francisco to Seoul. On my return, I fly from Seoul to Kunming where I have an 18 hour overnight layover until my connecting flight to Qingdao where I have a 13 hour overnight layover before my final flight to San Francisco. Since I'm not entering and leaving China from the same city, can I get a transit visa to leave either or both airports to go to my hotel(s)?

Thanks in advance!