Beachcombing and shellfishing on Vashon Island is a blast. You find so many cool things during low-tide. Everyone including kids and doggos love the beach during low-tide.
A great reource to see where is a safe place to go beachcombing and shellfishing is the King County Shellfish Information website found here: https://fortress.wa.gov/doh/biotoxin/biotoxin.html. This gives some great info on where to go and more importantly, where NOT to go for shellfish and beachcombing on Vashon Island.
Here is an example of the map and data it provides: