It may sound farfetched to you, but if your teens are hanging out in a rustic lodge by edge of town, you should still warn them about the bears.
I know it sounds wierd..but you need to live in the Vancouver area where there have been strange incidents. City of North Vancouver, a highly urbanized city...has this bear warning to all residents on their website
http://www.cnv.org/server.aspx?c=3&i=419
There are incidents several times each year, where the errant bear or so, have wandered into nicely civilized neighbourhoods with lawns, etc. And these area areas right in the city.
Last week, I was amazed to hear someone mention a cougar in the area. And apparently regular sightings of coyotes aren't totally far-fetched. I have seen coyote several times on my bike rides within the city. By a busy car road.
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I have seen a wild bear each time, a total of 3 different times. All sightings in Western Canada, 2 times were each on bike. No wonder why some European tourists love Canada...we still have big wildlife.