Cancun? Cozumel? Monterrey?

Maybe Mexico as a graduation present/vacation? Beautiful azure water and white sandy beaches... cocktails de camarones o guacamole para el almuerzo... a dip in a cool pool in the moonlight... snorkling... and nothing but rest and relaxation... And then a trip home to Monterrey to play barajas all day and drink Coca Light? I'm thinking that sounds pretty damned good...