Andy,
The book I recommend is "Afield and Afloat: South Puget Sound" and Afield and Afloat: North Puget Sound." I'm assuming you already have a Washington Gazetteer.
Are you starting to get excited with the treasure hunt?
Hey Karl - What was the name of that Gazzette? And I used Google Earth to get some locales....alot of em seem to run next to the canal on 101. I spotted five maybe six spots. we have a lot of freshwater/saltwater confluance and I have seen a lot of places where the points break off close to the shoreline.