Some things I would expect to work given the hints, don't.
"Bridge river", "Bridge stones", "use pole" or even "drop pole" in the right place didn't do anything, I had to "make bridge", which uses bridge as a noun, where the hint seems to clue you that you need to use bridge as a verb.
At the sandy beach "dig" doesn't work, although "dig" did work at the pole....
Now I'm completely stuck. Just by accident I "got" the sand... But now I'm stuck again....