Thank you Sondi!
We have had a new development regarding our vacation. My 84 year old mother-in-law will be unable to join us.
This change, though heartbreaking, opens up the opportunity for us to take advantage of the many walking tours. Which one to take advantage of, I really am unsure. I've gathered that it is risky, the luck of the draw can result in a good guide or an incompetent guide.
Sondi, thank you for the tip regarding Bunvenuto Limos. We may very well use a driver for some part of our exploring!