A bike trip from Feldkirch via Zürich (where I visited a friend and ex-co-worker at google and attended a Swiss Perl Monger meetup) and, along the Rhein, to Basel and Strasbourg, for the French Perl Workshop and some Act hacking. I covered 5 countries (AT, FL, CH, DE, FR) in 4 days, starting each day in one country and ending it in another (without a single passport check or, in fact, any indication of crossing a border; EU++)
The route back went up through Schwarzwald (with a big emphasis on up) to the source of the Danube (so I can claim to have seen both ends) and then along the Danube up to Ulm.
Scroll down (to after the map) for the per-day reports!
And here's what I rode, according to my ancient Garmin (with a few gaps, when it crashed...):