In one of the RS episodes of Lisbon he suggested that a personal guide is worth while- what sites should I use to find a good guide? Anyone endorsed by RS?
I can recommend Cristina Duarte. She was our RS local guide in Lisbon. She was knowledgeable and engaging. Her contact information is: lisbonbeyond.pt
Edited to add: https://click.email.ricksteves.com/?qs=1d40058b3cfa22179c68231f9e080818040b501f4a6c3a2733abb572b3f9c57027d54b32df78bcd594ef4227f3800cc93ef299c89b6ca2c6
We took a guided tour to Sintra with Lisbon Riders if that interests you. Our tour guide was Manuel. Excellent tour. lisbonriders.com
I highly recommend Heart and Soul Tours. Eduardo was an excellent guide.