I drew some of the passing multitudes, human, canine and avian. I did the drawings by looking intently at the person/creature for a few seconds then closing my eyes like a camera shutter - I make a little clicking noise in my mind - then drawing the photo I've taken on the back of my eyelids. It sort of works if you're not too fussy about the details.
The boat is a quick drawing in the 5 minutes before the group met up at the end of the day. The Aquabuses are little shuttles that scoot around the bay. I think they might be re-fitted bathtubs. But they are a bit more sea-worthy than my vertically-exaggerated drawing makes them look.