I wanted to help. As I speak German I looked at their Website, which is just annoying. There is no map, so you have to read all their stupid descriptions and try to count the saunas together.
Whatever, it is the biggest place near Kassel, the sauna area is nude, the swimming pool area (therme) is swimsuit. The sauna are should have outdoor pools, but the website is a mess and I cannot really figure out. Sorry I can't help.more.
If you are not already there, choose Frankfurt or Hamburg.
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