I have 8 hours between flights in Shanghai. Arriving 630 AM and Leaving at 2:30 PM.

City Sightseeing Bus is recommended to you. Upon landing, take metro line 2 to People's Square Station, Exit 2. Then, you can buy the ticket and hop onto the bus from the nearby Urban Planning Exhibition Center at No.100, People's Avenue. By the way, the 24h ticket costs CNY 30 per person. Have fun! :)