I took a bus from San Miguel de Allende to La Gruta four times in two weeks. The thermal baths are outside, except for the covered area where the water is the hottest. The natural setting is beautiful, and you can order drinks from the waiters that they'll deliver to you in the baths. It's a wonderful place to spend all day or at least several hours. A restaurant is available if you get hungry. You can get a massage or just lay by the pool, if you want to rest.
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