A Mexico City agency with a national tourism registry number (RNT 04090144363), running the day trips and weekends that are awkward to assemble yourself from the capital.
The one worth their fee is the monarch butterfly trip to Angangueo and the El Rosario sanctuary, which is four hours each way and needs an early start, a vehicle and the entrance arranged. They also run Teotihuacán, Taxco, Valle de Bravo, Puebla and the Pueblos Mágicos circuit.