Thanks thanks thanks!! I've been to Paris a few times, but the most recent visit was about 30 years ago , so... it's been a while!

I'm going to the opera the first evening I'm there (the day I arrive) to see an opera (in German, heh) I'm not at all familiar with (Berg's Lulu), and may go to the ballet another evening (since I'm skipping the conference banquet anyway), though now that I know about Fat Tire Bike Tours...