I too have done the Museum tour. In the courtyard while waiting for our trolley back to the ship, we were entertained by a local group of teens playing their instruments. I don't know if they were rehearsing or if it was a normal afternoon event - but it was very nice and the weather was beautiful. This would have been in the month of June.
Valentin sounds like a fun CD. On a riverboat - CDs make all the arrangements, when we had to change disembark ports because of high water, all that fell to the CD to arrange for each person.