We're thinking of doing Mexico City over the holidays with the Charter Club Christmas tour. This is a 9 day mostly inclusive tour. The tour hotel is the Sheraton downtown. It isn't cheap but seems to really hit the must see sites. Current U.S. dollar equivalent is about $3100 for two people.
If you've done this particular tour or if you have other options we should consider please post your observations here. We don't want to attempt to do this visit on our own, just not comfortable with the idea at our ages.
Thanks very much!