I used pink spinners on the north arm in the early afternoon, and didn't get a single bite. Maybe I wasn't casting far enough from shore.
Did you see any fish on the surface splashing or fining? If not they were probably not there. Pinks are a sight fishery, you fish where you see them. If you don't see them they are probably not there in large numbers. A pink spinner is perfect, as long as you can reach the fish you can see.
As others have said, the south arm has a stronger pink run.
As a starting point that's actually a good idea. Follow the crowds to figure out the productive areas to start with and then go from there.
I second this idea. Follow the crowds because they are following the fish. Also do not be shy of trying a lot of different places. If you have not caught or seen any fish within 0.5 to 1 hour, try another location. Also it is better to try after high tide, when the fish tend to push up the river. The further up the Fraser you are located the longer after the high tide you wait. I don't fish it much so do not know the timings. Someone else could probably chime in.
Brownsville, deas island, no 3, Gary point, derby reach. This isn't an exclusive fishery. Personally I hit deas, park in the second row at the far lot. Walk straight to the water (don't take the trail) and when your knee deep at 3/4 high tide move 3 boulders and one stone over. Nailed 80 fish in 3 casts! Every day!
Some great suggestions there, Google maps is your friend. Try them all, the more you go out, the more you will learn about what locations produce at what times relative to the tides. Ask people if they fish there often and they will generally share some information with you.
Good luck and I hope you get into lots of fish!