The best Perch fishing is at the North Jetty in Ocean Shores. If you can dig or turn over rocks to get some piling worms, nothing works better...it's like crack for Perch. You need to to find a rocky beach for gathering the worms. The beaches around here are all sand for the most part. A good place to get piling worms are at Alki Beach, just east of the main beach are some good size rocks you can flip over and collect them. Have fun.

P.S I don't know where you live, but any beach with good size rocks should be your Oyster.