A polarizing filter sounds much better than messing with a rubber hood against the window. I have one that I've used to cut down glare from water, but sadly it didn't occur to use it for glass. Those images are compelling evidence that the filter will work great. And good suggestion on the trains, take the windows out of the equation. No need to warn me not to apply that to flights, figured that one out myself!
As for tripods, I would at most carry a mini for the use case KYB described, getting a group shot if no one else is around. Full-sized tripods are usually too heavy and bulky to mess with, and apparently risky, so glad you saved the camera, CN!
I think I'll add dry bag to my list of things to consider. My camera bag... OK, bags, who am I kidding, anyone in this forum knows better... is(are!) water-resistant with a waterproof cover if really needed. I'll be doing some flatwater kayaking at one port, but I think I'll leave the camera behind for that excursion.
Thanks for the suggestions!