I will be disembarking Royal Caribbean cruise from Hong Kong to Tianjin on 6/21 at 7:30 AM

And staying that night in Tianjin. From 6/22 to 6/26 I will be staying in Beijing. My direct flight back to United States leaves at 4:30 PM on 6/26 which is approx 130 hrs. First do I qualify for no Visa and what Documents do I need to show etc my flight itinerary and hotels staying. And what is exact procedure to get in without Visa. Is there any chance of a problem, Thanks Greg