I ll make a little different recommendation. I lived in Campbell River for 5 years, I really liked my 30/30 when I was there. In fact, even though i have hunted Alberta for the last 5 years, I still more often then not take my 30/30.
Why you ask? Well for one the bush is real thick on the island, and a 30/30 is easy to carry and to shoot in the thick stuff. Also 30/30 ammo is relatively cheap to buy, so you can practise alot (to make a quick shot if needed) and its sold everywhere so you dont have to worry about finding some.
Also, Marlin makes quite a nice rifle in 3030 and you can get a stainless/laminate model too if you are worried about moisture/rain.
If you are worried about making a longer shot say in a cut block, just put a decent scope on it with some quick detach rings, you can use that when hunting the cutblocks then switch to the iron sights if its raining hard, or you are going into the bush

a scoped 3030 with a 150 gr will take any island buck alive out to 200 or so yards, which is the range 90% of game is taken anyways.
If you want to try a moose, a 3030 and 170 gr bullets has slain a ton of them so dont worry
If you want to buy what everybody and there brother shoots on the island buy a tikka T3 or whatever in 30-06/308/270 buy a scope for it and go to town... but I dont think you would ever feel unhappy with ur trusty 3030 at your side
my .02$
Luke