They're most likely going to Prague. But I found this "spoiler" on the TARA Forums:
I live in the Czech Republic and actually I've discovered the following:
- the scene shooted near Hradcanske Square was partially pretended - I mean reading the clues, running for cluebox...
- after that (?) team headed to Ice Arena in Letnany, Prague, where team had to score a goal. That remings the victory of the Czech Republic during Olympics 1998 in Nagano, Japan
- the Pitstop was located along the river Vltava, with a beautiful castle panorama
- as i know, people slept in Admiral Botel - that's a accomodation located aboard a ship
That's all I discovered... if any questions, write'm down.
I'm not sure if it's true though.