We had planned to return on the 2:00pm train from Osweicim to Krakow, but a taxi driver offered to drive us in a mini-van in half the time for only $10 each. Too good to be true. The fare ended up being much more than that, but it did get us back quickly.
We had hoped to see the Wawel Castle, but arrived too late to get inside anywhere but the dragon's den. So, after walking around the courtyard, we descended a huge, claustrophobic spiral staircase down to a huge empty cave, which we walked through, and out to the dragon, a huge sculpture that breathed real fire!