New cedar-top floating docks appeared this summer off Heart’s Desire and Shell Beaches, the result of a collaboration between one volunteer and Tomales Bay State Park. The docks, installed in May and June, were years in the making. In 2022, Inverness resident Marshall Livingston began volunteering for the park and exploring how to replace the aging dock and swim buoys at Shell Beach, where he has swum nearly every day for more than 50 years.…