alright as I am also from the Northern part of Vancouver Island I know this area quite well.
A good spot if you are coming off of Hornby Island is the Oyster river and Piggot creek. These rivers collect the gold that comes from the same area on Mount Washington that used to have a gold mine. If you go here however expect to travel on logging roads and climbing down steep banks to get to the river. You will find gold in pretty much every pan but dont huge nuggets, that is not to be said that some nuggets are out there to be found.
The bonanza river/creek and lake are not named this because of gold but were aptly named due to the large stand of old growth forest that the logging companies came across in that area. unfortunately the old growth forest is long gone now and they have begun to log the second growth. not far from bonanza creek is Zeballos river however. I Was there last week and a friend of mine had some really good success ... me , not so much.
My friend in Zeballos bulled a 5.5 ounce nugget from a crevice between two large rocks which he promptly sold for 8-9k and while i was there came across a decent amount of flour gold and some low ounce to 1/4 ounce nuggets as well. cool area to explore as well.
China creek in Port Alberni is supposed to be good but a large portion is claimed as well as mineral creek.
Last but not least there is a placer reserve out near Tofino and Ucluelet which i have yet to check out.
Overall though for a person coming off of Hornby your best bet is probably Oyster river as you can head out and still be back in time for the last ferry at night some good gold on the river and lots of history of gold mining operations in the area with very few claims.