i have a 15 hr stop over @ pudong shanghai where can i go for sight seeing?

You may take subway line 2 (or meglev train and then transfer to line 2 at Longyang Road) from Pudong Airport to Nanjing Road, explore the Bund area, Oriental Pearl Tower, Yuyuan Garden, Shanghai Museum, etc. You may visit the sites according to your own interests. Then get back to the airport at least 2 or 3 hours prior to your flight departure.