We came to LA Gruta after going horseback riding with Leisurely Country Horseback Riding. We did the day tour (riding, the best lunch we had in Mexico, and then to the warm pool, with Beth, the owner of Leisurely Country Horseback Riding swimming with us). It was a Thursday, late afternoon.
We came at a time the pools were not very crowded. The facilities were much cleaner than I expected. They were great, bathrooms, changing areas and many places to hang out. We spent our time in the first pool and going back to where the hot water comes in (the cave at the end of the tunnel). The hot water comes in very fast, so you can "massage" parts of your body with the water.
Our entire family loved swimming here. The water temp was perfect. It was nice to have Beth with us, as the kids loved her, and it allowed us to enjoy ourselves in the lovely water too.
If we had been in town longer, we would have explored the other pools. But it would have been hard to try the others and La Gruta was worth going back to.
This review is the subjective opinion of a TripAdvisor member and not of TripAdvisor LLC.