This one has a long history. It was built in 1955 as an L-20A and served in the US Army as 54-1693. It spent time with Air America in Southeast Asia, in Hawaii with the Civil Air Patrol, and in Washington with Kenmore Air before coming to California where it flies for Seaplane Adventures, a company that specializes in aerial tours of the San Francisco Bay Area and nearby coastal regions. That's Mt. Tamalpais in the background.