Paris

The plan is to unpack and assemble the bikes at the Gare du Nord, and stuff all the packaging in a left luggage locker. Then ride around Paris for three days, return to the station/locker, pack the bikes up again and go home! I think it's genius, altho I am quite curious to see if it actually works :)

You may want to make sure they still have luggage lockers. I haven't seen any in train stations for years.

Edit - looked myself. Conflicting reports: http://answers.yahoo.com/question/index?qid=20070718204047AAurbM5