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In Europe, there are many attractive natural waters with ‘excellent’ water quality that are not suitable for bathing due to their ecological vulnerability. Lake ecosystems in alpine and karstic areas, for example, are very sensitive, not only to pollution but also to physical disturbances. Bathing in high mountain lakes can also cause a process of re-suspension of sediment which is accumulated in the lake (Toro, et al., 2006). Swimming in such sites should be controlled. Environmental and potential human health problems might be presented at such sites in innovative ways to help raise visitor awareness and engagement into their protection. The case-study of a small alpine lake of Dvojno jezero in Slovenia (Box 13) demonstrates such issues around wild bathing in ecologically vulnerable environments.