I would head for an area with some snowmobiling activity in order to find packed down snow, though you'll want to stay off any designated OFSC trails, and far enough north to add some insurance on the ice. I would try the Mccrae lake area, any time I've been there's it's been riddled with snowmobile tracks all over the place.
One would assume when you said the statement above you meant in the present.
I live in the Kawarthas and it is very rare to be able to ride on a lake. If it is pure ice you need studs (super rare conditions). If there is snow on the lake you can't ride it unless you are following a well used sled trail, which is tough going. When you can ride on a lake it is usually a chilly ride the wind whips across keeping you cool. If it is a sunny day the snow gets too soft which makes it really hard going.
The ice is pretty rotten now due to the warm spell. The snow does not help and can cover thin spots. I would stay off the ice. Other than that all we need is some cold windy weather and the shore ice will be a blast.
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