Chines transit visa to undertake short tour in Shanghai.

I will be travelling to and from Japan by China Easter Airlines with a return route of Delhi-Shanghai-Okayama. On my 6th of May return journey, wherein, there is a layover of about 11 hours at Shanghai, I wish to take a short Shanghai tour before arriving in Delhi, the same day. i want to know the documents required for the same and the cost. i have Japan valid travel document stamped and a return ticket