Anyone care to share some experiences in central mexico?  I’m really bored here lately, and I think I could squeeze in maybe two weeks.  Flight to MEX is only $400, I’ve seen it cheaper, but not much.  So, any suggestion on what to do with two weeks? 
 
I’m thinking a few days in D.F. and a trip to teotihuacan
a couple days in Puebla, visit Cholula
Go to Oaxaca for a couple days
then to the beach around Puerto Escondido
 
Does that sound like too much for two weeks?  Anyone other places I shouldn’t miss? 
 
And while i’m at it, does anyone know if round trip bus tickets cheaper than one way?