I worked in Churchill for several summers when I was in school. No bear tours then, but the local radio station would announce any bear spottings. Typically at the town dump, sometimes along the shore. Queen Elizabeth came to town for the Canadian Centennial. The sole bear along the rocks was oblivious, but there were guys with rifles every hundred yards or so just in case the bear decided to run up the embankment and mug the queen. Quite funny, actually. The bears were viewed mostly mostly as somewhat dangerous pests.
Re northern lights IIRC we had to look more to the south to see them, but they are visible to varying degrees from the northern US up into the high latitudes. If that is your main interest there are lots of places easier to get to, connected by road. Lynn Lake or Thompson for example.