Having commuted by ferryboat for the last 40+ years, till my retirement two years ago. I always had a library of books in my work vehicles, in case there was a backup at the ferry line. It was also a good time for doing work paperwork on the way home as well as finishing required job diaries. My library diminished somewhat in the last ten years, since I also had a computer with me at all times commuting, sailing, and traveling. Much of my writing, composing and what have you was done on a computer as well, since it can be done so much faster, because editing is more streamlined.
Since most of our jobs were on the waterfront of the Puget Sound, and on up north to the Straits, the San Juans and Bellingham. Sometimes I would take one of our boats, since I sleep on the boats better then I did on noisy derrick barrages or hotels. I would keep a mini office on board as well as job spec manuals and engineering and tech manuals. I'm not a fiction reader as well, having read very little fiction since the early 70's, with the exception of Tom Clancy novels in the early 90's.
Having all the supplies needed for drawing and sketching, I always found invaluable for taking care of as-builts for the job, as well as more artistic bent from landscape, to architectural and portrait work Also a good time for work, boat, and home project lists. Letter writing seems to be a lost form these days with the advent of laptops and smart phones. But other forms of writing can be tackled as well, there's a whole spectrum of things to write about.
There's always maintenance to be done on the boat, as well as organizing and keeping everything shipshape on board and keeping the galley spic and span. I also like getting up early for a good long walk in the morning, and another in the evening, walks are good for the body and mind, and helps us old timers keep limber.