Can we undertake the following travel without a visa?

We're flying from Australia to Shanghai and will stay five days (hopefully on a 144hr free transit).
From Shanghai we'll be cruising to Korea
From Korea to Tiajin China (will not be disembarking at Tiajin port - will remain on board as we do not have visas)
From Beijing back to Korea
Then to Tokyo where we disembark.
From Tokyo to Shanghai for one night (again on a 144hr free)
From Shanghai back to Australia