We spent 6 nights in Bordeaux last fall and I really enjoyed it. We were on the same tour as poster Pam above (different departure date but same itinerary). I loved the city. It was great for strolling, the riverfront area was very nice, and the pedestrian pathways were hopping with people, restaurants and shopping. It is a very lively and fun place and, having no expectations of the city, I was charmed.
We also loved Les Bassins does Lumieres - which is a light art exhibit built into the frame of an old World War II submarine base built by the Germans. The light/art show in this place is spectacular…the scale/size of the thing was so impressive.
@acraven mentions the Centre Jean Moulin, which was high on my list of sites. When we finally found the correct building it was abandoned and derelict-looking. It has been closed for some time and there is no plan to reopen that our guide could sort out.
Make sure you eat the city pastry specialty - a canale, a vanilla mini-cake thing - soft, tender custard center and a caramelized crust. Some days I ate 4 or 5 of these things!