Important notice to all tourists without snow / ice experience:
Never walk onto an icy lake without speaking before to a local if warnings from walking on icy lakes are existing - especially not at days with repeating day temperatures around 10° C.
Another indicator for not going onto the ice is that nobody else is on the ice - and even if other people are on it, it does not mean that the ice carries people everywhere.
Background article: https://www.bluewin.ch/en/news/more-than-a-dozen-people-collapse-in-icy-lake-2592957.html
Short video with German subtitles (maybe geo-fenced): https://www.n-tv.de/mediathek/videos/panorama/Webcam-haelt-dramatische-Rettung-auf-Eibsee-fest-article25613561.html
Rescue people sometimes need to risk own health or life to save others. This is not necessary if everybody takes care of its own safety!
Although it happened in Germany I post it in General Europe because around Alps and in the mid and northern parts of Europe the danger is the same.