The trolley tour of Boston, offered as an optional, is the best way to see the entire city. Take it at your own pace, but I would suggest stopping off at the USS Constitution and Fenway.

ankopsu Article on Boston

If you visit the massive outdoor club Rio, also go next door to the 'Green Pardon' which is much cheaper, and has about 5 bars and three separate dance floors - all outside. Party till the sun rises!

Mike Contiki Article on Budapest

I dont think anyone has ever said they didnt enjoy George's boat! Its by far the best optional on tour! The water is amazing and George is quite the entertainer ;)

Steftacular Article on George's Boat, Corfu