I think 1 and 5 are my favorites too, though I like the others as well, and beyond this, when you say a "water walk", I'm relating that back to some of the recommended reading as to picking theme that limits what one looks for on such walks.
This is all very instructive and helpful, mishlove. Thanks for sharing it by example.
"'There's more to a picture than meets the eye; hey, hey; my my." - Neil Young