I have fished the saltwater around Rupert. Not an expert by any means. The local tackle shop on the main strip provided me with lots of good info - location and technique. Many seem to fish Springs in close mooching or slow troll with cut plugs (right off the kelp). When coho are in everything works. If you have the money get a guide at least the first day or two.
You need to be a seasoned boater, GPS, sounder, charts, VHF, radar if possible, etc as the area is challenging (shoals, reefs, tides, exposed open areas, fog, you name it). I fished Smith ISland, Stephens ISland around Tree Nob, and north of Duncan Bay.