I could kick myself that I didn't decide to go to Rome one day earlier. I could have easily left on Wednesday instead of Thursday, since Wednesday is a holiday. It never occured to me that the Vatican would be closed all day on Sunday (It is a church!), and that they would be closed a half day on Saturday. So, I have now purchased a 10:30 a.m. Saturday ticket for a two hour Vatican / Sistine Chapel tour.
Anything else I get to see will be gravy, I guess.