My husband and I did the trip to Padua last summer during the day the ship sat in Venice before sailing away at the start of our cruise. It was a nice excursion. We pre-booked our own reservations to see the Scrovegni chapel, and then hired a driver for the round-trip from the port to Padua and back. Be forewarned that your visit to the chapel will only be 30 minutes, 15 minutes to adjust the humidity level and 15 minutes in the chapel. But it’s worth it! There is also a nice little museum at the site, with a pretty sculpture garden and café.