Art is big in Oaxaca. It is a center for black pottery and Alebrijes, colorful wood carvings. There are studios in the area. I went on a day tour of Monte Alban and visiting some of these studios. It was all in English and we were driven around in a minibus. Don't remember the price, but it was reasonable. Also did taxi to/from airport and I don't remember, which means nothing shady happened and the price was reasonable. I was lucky the the Oaxaca Symphony happened to have a concert while i was there. It was free. Definitely worth visiting, though 5-6 days is probably sufficient. I stayed a week and recall I could have cut it by a day or two.