There's also an attraction=water_slide[0], it isn't rendered in the current stylesheet but it's the correct tag to use :)
I'm respondible for some swimming pools multipolygons, the explaination is that in water parks there are these big water areas in which you can walk or swim, but there are some 'islands' inside. Here's an example http://osm.org/go/xT3TtKM0f-- Cheers, Stefano [0]http://wiki.openstreetmap.org/wiki/Proposed_features/Key:attraction
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