A few years ago, the city installed refrigeration equipment under the plaza near the chalet at Beaver Lake. This means even when the weather goes a bit above 0°C the ice stays hard. The rink is well maintained with plows and zambonis along with shovellers and sweepers so it is a popular spot for skaters. The nearby chalet provides rental skates and more importantly a cafeteria where you can get hot drinks.
One part of the rink is reserved for beginners, with cones and metal devices which can be pushed while those less steady on their feet learn how to skate. I've never been comfortable on skates, but love to watch as others glide around.