This whole town is worth a visit if you can. The cathedral/church is ok as are many of the churches and buildings but the reason I am reviewing this particular one is because of the markets surrounding this area. You can find hand crafted goods, at a good price and interact with the Mayan locals too.
As far as sustainable tourism goes it doesn't get much better than this. Sample some food, buy some souvenirs and get a feel for what the Zapatistas are trying to support!
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