[Fiction question] What kind of boat does my character own?

My character “J” affects a pose of “captain” and owns a boat, a yacht, which he docks in San Diego. He lives in a coastal mansion near San Diego (where?). But he does not actually do any of the work of driving or maintaining the boat. He just gives orders and strides about and poses and plays host. (This is not the good guy of my story.)

What kind of boat is it?
Where does he dock it?
What does he wear?
Where does he live?

See also this question. When my question quota reopens, there will be more.