I love thermal baths and went the Ischia specifically to visit them. I have been to baths and spas all over the world (Tobocan, Blue Lagoon) and honestly, Castiglione disappointed me.
WEAR FOOT WEAR! This is no place to be barefoot! The paved areas have some kind of harsh rough brick that really hurt my feet (I had not brought flip flops) and the grass was much much worse. Near the Lotus pool (super hot, 40 C) I stepped on the grass into long sharp thorns that I had to pull out of my feet! This hurt.
I probably would have liked Castiglione much more with foot wear, but it still was more like a family water park than a place for quiet relaxation. The large swimming areas were full of small children, and several of the larger thermal areas seemed to be flirting hang outs for the 20 somethings.
You need to wear a swim cap here, which they sell in the shop for 3 euros, and towel rental is 2 euros. You have to ask to rent a towel at where you turn in your clothes at the changing room; it is not immediately obvious.
This, I think, would be a good place to come with children. There are some very nice thermal areas and options and large swimming pools. The site is lovely with a beautiful view of the sea beyond. But I did not find it particularly restful. Children dominated the large swimming areas and I think most of the clientele were families with yearly memberships. Far nicer than the local swim club here, but not what I want to pay thermal bath prices to experience!
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