So far the Oaxaca area is quiet, you as a tourist will not have problems, it is only on the road between Cuernavaca and Acapulco that the students (want to be comunists) and the narcos are restless, yes Oaxaca the state and the city are amasing, in the city visit the "tiangis" open air marquet and purchase some chapulines to have with your mescal or beer instead of peanuts.
There are two main archeological sites that are must see, Monte Alban and Mitla,
Monte Alban is a mountain citadel with a ball court, on the side of the ball court half way down to the other corner there is a tunnel, small crawll only that goes to the structure in the center of the court yard, the shamas would use this tunnel to pop up as if by magic on the central structure during the ceremonies do not try to crawll in there it is narrow and can colapse.
On the opposite corner of the ball court on the outside wall there are some massive stones that form a wall, those stones were brought from a different place, about 60 miles, it is amazing how the ancients moved those huge stones, powerfull juju?
Mitla is more of a religious and trading center, there the interesting features are the tombs that have endured the earthquakes for centuries, if you go in they are built as a small cross, look at the way the walls and the placement of the roof slabs, they do not touch, this prevents the walls from colapsing with the roofs slab movement during teluric movements.
At the Zocalo in Oaxaca City engoy a mescal with your chapulines and have some mole Oaxaqueño, different than the mole Poblano beer goes vey well with the mole.
Take it easy enjoy the sites, enjoy the food and the company and above all else enjoy life.
navegator