My last trip was 13 months ago, my family and I went to Querétaro, San Miguel de Allende and Theotihuacan's pyramits. The idea was celebrate chrismas with my whole family who lives in México City.
All places we visited were beautifil and clean. Querétaro has a nice whether, at least un that time. All those cities have a lot of history, Querétaro was one of the principal cities for Independence figth for México and as you imagine Teotihuacán is really wonderful.
If some day you decide to visit my country, those cities are really nice. México has more than beautifil beaches.