I used to live a block away from the Cap. It is a wonderful river that can be fished whenever there is a skiff of water. If you look at the number of fish that return and its short length, it has one of the highest fish per kilometer ratings in the country, when fish are comming into the system.
One of the problems is that, as fishers, we have a tendency to get set in our ways and go to the same spots and use the same gear.The first couple of years that I fished the Cap, I had moderate success. And like most regular fishers on the system, I bitched about the crowding at all the local spots when the word got out that there were fish in the system.
Well, the crowding actually was a benefit. It forced me to start to fish away from the crowds. I learned to fish pocket water. I learned to sight fish. I learned to experiment with a variety of different gear, baits and presentations. I learned to keep an accurate daily log of where I fished, what I used, what worked and what I saw work for other people. And yes, I learned that some areas are just more effectively fished with a fly rod. As a result, my success rate went way up.
I don't live in the lower mainland anymore. But, I do get to Vancouver every couple of months. I always bring a rod and my fishing log with me and usually get a chance to spend a couple of hours on that little urban gem. And no, I don't head straight to Cable Pool, I usually start out probing some of that crappy looking broken water in the lower half.
I envy anyone who has the opportunity to fish the Cap on a regular basis and learn the river. Be patient and you will be successful.