We, three adults, visited the caves on a dull day in November. We did the Ruta Basica which was about an hour and a quarter long and reasonably easy. You need sensible footwear and a willingness to do a bit of scrambling - oh, and you need to be happy squeezing through fairly small spaces. The caves are completely authentic, no lights, no steps, so you wear a helmet with a light on it. There were only five of us on our tour, us and a Spanish couple and our bi-lingual lady guide was fantastic. I'm sorry I didn't get her name. She was good fun, efficient and very keen to make sure we all had a good, safe time. I would recommend this trip to anyone with a reasonable fitness level, It's also good value at 13 euros per adult.
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