You do this trip to the pyramids of Teotihuacán in just one day, just 1 hour from Mexico City, you can climb the pyramids of the sun and the moon, being at the top you will feel a unique energy.
And if you want to have a different experience, you can get on a hot air balloon, there are many companies that do this type of balloon ride and give you a ride to see this wonderful place from the skies.