In the Vashon area, a good place to try is over on the Southwest side of Blake Island. There is a very deep hole, 300ft plus.

Allen Bank is always worth fishing...

A better place though is the Narrows, under the bridge. Pick a day with moderate to slow tides and stay in touch with the bottom. Be careful about snagging the old bridge, it's easy to do, but that's where the Lings are.

Jig up some flounder between Point Evans and the bridge and use them for bait. Live flounder have been known to catch very nice Lings there, sometimes while reeling in the flounder!