The Hama Hama Company is a shellfish farm started in 1922, located where the nearly unbearably scenic Hamma Hamma River meets Hood Canal. The same family still owns the company, and they are approximately the nicest people in the world; their retail store is open seven days a week, year round, and there you can get the Hama Hama oysters and clams you'll find in some of Seattle's greatest restaurants at their utterly freshest (and cheaper, too). While you're at it, learn about oyster cultivation and biology, and have a picnic on the waterfront. Check the Hama Hama Oyster Blog
for their springtime Hama Hama Oyster Rama, which may be the world's best festival of bivalves.