I'll have a 11 hours lay over stop at pudong airport, where do you think I could spend some time?

Hope they are in the daytime so that you can have a chance to see the city. Experience the Maglev train first. For the distance of almost 30km, it only takes 8min. Then take subway line 2 to East Nanjing Road for shopping and dining. Thereafter, walk to the Bund for a sightseeing. At last, I wanna remind you that arrive at the airport at least 2 before departure.