Take a travel rod of some sorts. I bought a telescoping rod from the nice people at riverside. Pinks were just starting to show up when I was there a couple weeks ago. I caught one, but with my bare hands, and then put him back in the main channel. There would definately be a few rivers and creeks that would have em on the hike, so dfinately give it a try. Also lots of small (8 inches or so) cutties in most of the creeks and rivers, and at the ferry crossing, there are bucket loads of perch, trout, and salmon all mixed in trying to get the scraps from the crab lunches.
I didn't have any luck fishing the ocean mainly because it was to rough to get into a good spot, but you might be able to fish off the end of a surge channel.
Which way you heading? The 5km closest to pt. renfrew is by far the hardest section. I still have nightmares about it.