I'm staying at the Bund Riverside hotel. How can I go to Pudong international airport ?

If your luggage is not huge, it is ok to travel by subway. Walk from your hotel into East Beijing Road and turn into Middle Henan Road to get to East Nanjing Road metro station to take subway line 2 to get to the airport directly.

But if you have many and large suitcases, you are advised to take a taxi to reach.