I've been to zeebad for a long weekend at the end of May, the location was perfect, close to the sea, where we and our dog had a very good time.
The indoor pool is small, the place (nr60) was perfect for us at the edge of the camp ground at the sea. This is THE camping for people who expect nothing from a camp ground and like walking, cycling and the sea. Good sanitary facilities and showers equipped with thermostat taps.
The only thing I missed was a bar where you could relax in the evenings, but that is the only disadvantage.