We took the opportunity to visit my brother and his wife in Mexico City, where he took a position with his long-time employer for about 2 years. They were in a rental house in a very nice country club area, and they had 2 drivers who switched off each day, taking Myron to his job with a 1 1/2-2 hour commute each way. His wife Cathy is good at finding and exploring the cultural sites, so she had a great list of ideas for us.

We chose to visit many ancient ruins and a few historic sites. Our first full day we visited Teotihuacan Pyramids and then the Tula Archeological Site. Both were large and impressive and easy to navigate and explore.
Cathy is not a big fan of heights, particularly when maneuvering steps that are steep going down and without hand-holds, so it was quite an accomplishment when she did so at the ruins - Woo Hoo!
After the Tula site, we were somewhat close to Myron's work, so the driver took us over there and he met up with us just after 6 pm.
 The typical Mexican schedule is like many Latin American countries, with the mid-day meal somewhere between 2 and 3 pm, and the evening meal being a bit smaller and later, maybe from 8 to 10 pm. So we were just in time to enjoy dinner at their home around 8.
The next day Myron took off from work to join us and we went to a couple more historic ruins sites, Cacaxtla, the world's 2nd largest covered ruins (right after the Terra Cotta warriors in China) and then on to the tunnels of the Puebla pyramids. Both were amazing, detailed and phenomenal.
On Saturday, Myron worked 1/2 day while we were lazy bums and then we all headed off to a large area of the city which is bigger than New York's Central Park and includes a free zoo, 2 lakes, street vendors and a castle, all in the Chapultepec area.
Sunday is when we had the driver take us to a quaint place, San Miguel de Allende, which was just named the #1 town in the world by Conde Nast and their over 1 million voters.
Cathy and I had reserved rooms at the La Puertecita Boutique Hotel and it was a very nice place: built on a hillside with really big suites and private patios. We enjoyed the town square, historic cathedral and other buildings and the many artisans in the marketplace. Mike and I ventured up several jardins to a Mirador, a high point lookout, while Cathy and Myron shopped. The town is completely cobblestoned, so I felt fortunate that none of us twisted an ankle during our stay. Breakfast next morning was included and we were pleased the place was not crowded, we think more tourists would have been there on the weekend.
On our drive back to the City on Monday, we did a side trip to Tequiquiapan, a wine and cheese area with fewer tourists. It was very nice.
On Tuesday, Myron still took time off from work so we all went into the middle of the City, the Federal District, to be official tourists and enjoy the Centro Historico/Zocalo and the Templo Mayor ruins which are being preserved beneath the Cathedral and National Palace, plus going up to the 45th floor of the world's first major skyscraper. We enjoyed a big buffet lunch at the rooftop of the Holiday Inn.