I am a US Citizen and I will be arriving into Beijing on Aug 4 staying 1 night to tour

then will take a 7 night cruise from Tianjin on Royal Caribbean's Ovation of the Seas to Nagasaki, Japan and Sakaiminato, Japan and Kyoto, Tokyo. (Which the cruise line said I do not need a visa since we are covered under the 144 hour free visa) I was just concerned of the 1 night prior to the cruise when we arrive into PEK at 3p and get on the cruise the next day at 2p.