Eddie,

The southern rivers (Green, Puyallup etc...) don't get anywhere near the return that the northern one's (Snohomish, Skykomish, Stillaguamish, Skagit) do. I'm not even sure if it's legal to target them down there?

My advice would be to fish either the Snohomish river anywhere off of the Lowell River road between Everett and the town of Snohomish, or the Lower Skagit in the Mt. Vernon/Sedro Woolley area.

By the first week of September both rivers should have plenty of fish, and there's ample bank access. Break out the trout rods with small pink or chrome with a chartreuse tip Dick Nite spoons, look for rolling fish, and you and your 11 year old will be in business.

Maybe you could get Grandpa to take you guys out to Shipwreck/Humpy Hollow in mid-August for some salt-water action too!