There are at least two DUKW's in Philadelphia doing river tours.
Is seems as if they hold about 30+ people in each one.
They swim up and down the riverfront and then beach near the Ben Franklin bridge and do a driving tour of historic areas.
The humor on these Ducks as they call them is quite cheesy, but fun for the kids. Plastic duck bills are handed out, and going home from work today, they played the theme from COPS when passing by some police next to the Liberty Bell.
Keith Walker