Hi we are staying at the Shanghai Theme Park Wassim Hotel. Where is the closest Big bus tour stop?

Well, there is no tourist bus stop nearby the hotel. Thus you are advised to go to Nanjing Road, New World Centre Bus Stop. (Located at the opposite Madame Tussaud's by People's Square Metro Exit 7)
From your hotel, take a cab to Chuansha Station. Then take metro line 2 to People's Square, Exit 7. Then walk northeast around 500 yards to find the pick-up station. :)