Can't go wrong with any of those spots mentioned
I have a couple that I would like to add:

1) Concrete dock on Fox Island. This is a good Blackmouth spot. Better whe the Silvers come home. Ususally lots of bait holding in this area around slack tide. Cut plug and 1 or 2 oz of lead should put you into some fish.

2) Spit at the entrance to Gig Harbor. Great spot for Silvers.

3) Evans Point. Used to be a trail down the hill. I haven't been there for awhile. On a good low tide, you can walk down the beach from the Narrows Bridge.

4) Pt Fosdick. Access at the end of Pt Fosdick Drive. Hit the beach and head left. There are some clay banks to the left (you can only notice these at a minus tide so be careful). Largest rock on the beach is the telltale sign of the start of the clay banks. Keep working north until the water shallows out...

Downriggin'