Thanks, guys. Here's another one. And no, the tracks are not procedural, but a repeated mask. It could well be possible to find some math to get this profile (inside a simple shape), but I'd rather use a small mask, which is much easier than all those blue nodes. It would probably need a bunch of semi-overlapping simple shapes to contain the different patterns anyway, too much work.
I'm not pleased yet with the wet sand edge, the wet tracks, the sand itself and such, but as usual, this grew from testing my mask.
