There is a world of difference between ice-skating in a rink and ice-skating on natural ice. So I love frozen lakes, but sadly, our local lakes are small, and with ever warmer winters, the ice doesn't get thick enough. Not to mention sea ice which Denmark hasn't seen in 2 or 3 decades. Plus, when we do get ice, it may be all "ridgy" from the wind and waves while freezing. All this is better in Sweden, so I went to visit friends in Stockholm. No sea ice either yet, but miles and miles of frozen lakes.
In the city itself, there is a warmer micro-climate, and the ice is fragmented, freezing at night and melting in the sun (max. 7-8 hrs, but still). But water on ice yields even more beautiful reflections.
Sunrise is magical on the ice. I watched the skyline changing through an orange caleidoscope for half an hour.
They have the ice we don't , and they also have skates we don't - special Swedish long distance running skates, which are faster and nicer on the feet than hockey or rink skates. Plus they go over rough ice much better. I joined a group for a tour from Kungsäng on the outskirts of Stockholm to Sigtuna, the old Swedish capital. 19 km of icescape, a chain of lakes that goes on all the way to Uppsala.
Not everybody uses the ice for skating, though. There is ice sailing, and if you can make holes in the ice, there's ice fishing. Or winter bathing, but I didn't see that ...
The best ice is black (core ice or steel ice), it's smooth and strong. You get white ice from snow freezing in the water, and it's less smooth and less dense. In the picture there are patches of another type of white - glass ice with air underneath. The upper layer crack when you pass over it, and tries to trap the skates. Unpleasant. The rift in the background is from the last boat crossing the freezing lake.
Smaller cracks are no problem, but there can be a level difference from shifting ice plates.
Street photography on the ice, when we arrived in Sigtuna. High heels on the lake, and she didn't slip. Must be a Swedish girl.
Another, smaller lake. Safely frozen in a Swedish winter postcard setting. Waiting for the moose. Well, at least I saw a beaver's hut.