I will be in Mexico City for four days and would like to do a day trip to Puebla. I'm hoping to get to see the ruins and explore some of architecture. Estrella Roja bus lines seem to have near half hour to hourly departures. I was wondering if anyone else might have done this or if anyone had any suggestions for me to get the most out of the day. It looks like I will have around 9 hours total in the town itself. Thanks for the help!